Hi,
Interesting news article on the power of leaking acetylene😬
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were damaged as a result of the blast, Ottawa County sheriff’s deputies said.
Allendale Township firefighters and deputies responded to a 6:30 a.m.
report of an explosion Wednesday near 68th Avenue and Sunset Drive in Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car overnight. Investigators determined the explosion was triggered either
when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
On 9/27/2023 1:05 PM, Leon Fisk wrote:
Hi,
Interesting news article on the power of leaking acetylene?
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a
vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were
damaged as a result of the blast, Ottawa County sheriff’s deputies said.
Allendale Township firefighters and deputies responded to a 6:30 a.m.
report of an explosion Wednesday near 68th Avenue and Sunset Drive in
Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car
overnight. Investigators determined the explosion was triggered either
when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
I have been told more than a certain volume of acetylene in "free air"
can self detonate or detonate from turbulence. I had an accident here
at the shop some years back where there was no apparent source of
ignition. Just somebody in open air sticking their hand in front of the
flow the flow from a cracked valve. There was no physical contact, and
no obvious source for static. I mentioned it in this group not long
after it happened. Gunner and a few others told me there had to be an >ignition source, but I was standing right there. In fact I was reaching >towards the valve to shut it off when it ignited. Then we had a blow
torch pointed at the corner of my shop building. I went back in the
shop to grab a welding glove so I could shut it off.
The person with their hand in front of the valve got burned, but not as
badly as you might think. Their whole hand was red, and the outer
layers of skin all sloughed off over the next few days. They got their
hand out of the fire pretty quick. Worse than a regular first degree
burn, but not the worst burn I've seen called a second degree burn. It
was mostly bad because it was over their whole hand.
We could argue about whether it was an explosion or a conflagration. It
had a pretty healthy pop for an uncontained event. Faster than a
whoomp, but maybe not quite a crack.
--Free acetylene is unstable above about 14PSI and can detonate without
Bob La Londe
CNC Molds N Stuff
Free acetylene is unstable above about 14PSI and can detonate without external oxygen. If you are feeling particularly brave or stupid take
a steel block and drill a hole in it then find a snug fitting steel plug/shaft to fit the hole. With the open end of the hole facing down (acetylene is lighter than air) fill the hole with pure acetylene fron
a torch and insert the steel plug, turn it over on an anvil and hit
the plug with a hammer. If you are even stupider or braver, use a
copper "firing pin" as copper acts as a catalyst to promote the
breakdown of acetylene.
Just make sure all your various insurances, including life insurance,
are paid up!!!!
On Wed, 27 Sep 2023 16:07:16 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/27/2023 1:05 PM, Leon Fisk wrote:
Hi,
Interesting news article on the power of leaking acetylene?
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a >>> vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were
damaged as a result of the blast, Ottawa County sheriff’s deputies said. >>>
Allendale Township firefighters and deputies responded to a 6:30 a.m.
report of an explosion Wednesday near 68th Avenue and Sunset Drive in
Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car
overnight. Investigators determined the explosion was triggered either
when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
I have been told more than a certain volume of acetylene in "free air"
can self detonate or detonate from turbulence. I had an accident here
at the shop some years back where there was no apparent source of
ignition. Just somebody in open air sticking their hand in front of the
flow the flow from a cracked valve. There was no physical contact, and
no obvious source for static. I mentioned it in this group not long
after it happened. Gunner and a few others told me there had to be an
ignition source, but I was standing right there. In fact I was reaching
towards the valve to shut it off when it ignited. Then we had a blow
torch pointed at the corner of my shop building. I went back in the
shop to grab a welding glove so I could shut it off.
The person with their hand in front of the valve got burned, but not as
badly as you might think. Their whole hand was red, and the outer
layers of skin all sloughed off over the next few days. They got their
hand out of the fire pretty quick. Worse than a regular first degree
burn, but not the worst burn I've seen called a second degree burn. It
was mostly bad because it was over their whole hand.
We could argue about whether it was an explosion or a conflagration. It
had a pretty healthy pop for an uncontained event. Faster than a
whoomp, but maybe not quite a crack.
What was the humidity then?
I'd bet on an unnoticed ESD (electro-static discharge), which can be
caused by the air causing things to flutter against one another.
Just walking across a carpet can generate enough static electricity to
make a sharp crack sound.
Joe Gwinn
On 9/27/2023 1:05 PM, Leon Fisk wrote:
Hi,
Interesting news article on the power of leaking acetylene?
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a
vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were
damaged as a result of the blast, Ottawa County sheriff’s deputies said.
Allendale Township firefighters and deputies responded to a 6:30 a.m.
report of an explosion Wednesday near 68th Avenue and Sunset Drive in
Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car
overnight. Investigators determined the explosion was triggered either
when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
I have been told more than a certain volume of acetylene in "free air"
can self detonate or detonate from turbulence. I had an accident here
at the shop some years back where there was no apparent source of
ignition. Just somebody in open air sticking their hand in front of the
flow the flow from a cracked valve. There was no physical contact, and
no obvious source for static. I mentioned it in this group not long
after it happened. Gunner and a few others told me there had to be an >ignition source, but I was standing right there. In fact I was reaching >towards the valve to shut it off when it ignited. Then we had a blow
torch pointed at the corner of my shop building. I went back in the
shop to grab a welding glove so I could shut it off.
The person with their hand in front of the valve got burned, but not as
badly as you might think. Their whole hand was red, and the outer
layers of skin all sloughed off over the next few days. They got their
hand out of the fire pretty quick. Worse than a regular first degree
burn, but not the worst burn I've seen called a second degree burn. It
was mostly bad because it was over their whole hand.
We could argue about whether it was an explosion or a conflagration. It
had a pretty healthy pop for an uncontained event. Faster than a
whoomp, but maybe not quite a crack.
Standing on concrete outside in one of the driest climates on earth. I
wear rubber sole shoes pretty much all the time. Either sneakers or
walking boots. The OP usually wears rubber sole shoes as well. I still
have very good discrete hearing. (I still have my high frequency
hearing as well.) The only sound I heard was the detonation. Its
possible, but it sure didn't seem like it.
On 9/28/2023 3:19 PM, Joe Gwinn wrote:
On Wed, 27 Sep 2023 16:07:16 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/27/2023 1:05 PM, Leon Fisk wrote:
Hi,
Interesting news article on the power of leaking acetylene?
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a >>>> vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were >>>> damaged as a result of the blast, Ottawa County sheriff’s deputies said. >>>>
Allendale Township firefighters and deputies responded to a 6:30 a.m.
report of an explosion Wednesday near 68th Avenue and Sunset Drive in
Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car >>>> overnight. Investigators determined the explosion was triggered either >>>> when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
I have been told more than a certain volume of acetylene in "free air"
can self detonate or detonate from turbulence. I had an accident here
at the shop some years back where there was no apparent source of
ignition. Just somebody in open air sticking their hand in front of the >>> flow the flow from a cracked valve. There was no physical contact, and
no obvious source for static. I mentioned it in this group not long
after it happened. Gunner and a few others told me there had to be an
ignition source, but I was standing right there. In fact I was reaching >>> towards the valve to shut it off when it ignited. Then we had a blow
torch pointed at the corner of my shop building. I went back in the
shop to grab a welding glove so I could shut it off.
The person with their hand in front of the valve got burned, but not as
badly as you might think. Their whole hand was red, and the outer
layers of skin all sloughed off over the next few days. They got their
hand out of the fire pretty quick. Worse than a regular first degree
burn, but not the worst burn I've seen called a second degree burn. It
was mostly bad because it was over their whole hand.
We could argue about whether it was an explosion or a conflagration. It >>> had a pretty healthy pop for an uncontained event. Faster than a
whoomp, but maybe not quite a crack.
What was the humidity then?
I'd bet on an unnoticed ESD (electro-static discharge), which can be
caused by the air causing things to flutter against one another.
Just walking across a carpet can generate enough static electricity to
make a sharp crack sound.
Joe Gwinn
Standing on concrete outside in one of the driest climates on earth. I
wear rubber sole shoes pretty much all the time. Either sneakers or
walking boots. The OP usually wears rubber sole shoes as well. I still
have very good discrete hearing. (I still have my high frequency
hearing as well.) The only sound I heard was the detonation. Its
possible, but it sure didn't seem like it.
On Thu, 28 Sep 2023 15:55:39 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/28/2023 3:19 PM, Joe Gwinn wrote:
On Wed, 27 Sep 2023 16:07:16 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/27/2023 1:05 PM, Leon Fisk wrote:
Hi,
Interesting news article on the power of leaking acetylene?
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a >>>>> vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were >>>>> damaged as a result of the blast, Ottawa County sheriff’s deputies said.
Allendale Township firefighters and deputies responded to a 6:30 a.m. >>>>> report of an explosion Wednesday near 68th Avenue and Sunset Drive in >>>>> Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car >>>>> overnight. Investigators determined the explosion was triggered either >>>>> when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
I have been told more than a certain volume of acetylene in "free air" >>>> can self detonate or detonate from turbulence. I had an accident here >>>> at the shop some years back where there was no apparent source of
ignition. Just somebody in open air sticking their hand in front of the >>>> flow the flow from a cracked valve. There was no physical contact, and >>>> no obvious source for static. I mentioned it in this group not long
after it happened. Gunner and a few others told me there had to be an >>>> ignition source, but I was standing right there. In fact I was reaching >>>> towards the valve to shut it off when it ignited. Then we had a blow
torch pointed at the corner of my shop building. I went back in the
shop to grab a welding glove so I could shut it off.
The person with their hand in front of the valve got burned, but not as >>>> badly as you might think. Their whole hand was red, and the outer
layers of skin all sloughed off over the next few days. They got their >>>> hand out of the fire pretty quick. Worse than a regular first degree
burn, but not the worst burn I've seen called a second degree burn. It >>>> was mostly bad because it was over their whole hand.
We could argue about whether it was an explosion or a conflagration. It >>>> had a pretty healthy pop for an uncontained event. Faster than a
whoomp, but maybe not quite a crack.
What was the humidity then?
I'd bet on an unnoticed ESD (electro-static discharge), which can be
caused by the air causing things to flutter against one another.
Just walking across a carpet can generate enough static electricity to
make a sharp crack sound.
Joe Gwinn
Standing on concrete outside in one of the driest climates on earth. I
wear rubber sole shoes pretty much all the time. Either sneakers or
walking boots. The OP usually wears rubber sole shoes as well. I still
have very good discrete hearing. (I still have my high frequency
hearing as well.) The only sound I heard was the detonation. Its
possible, but it sure didn't seem like it.
The ESD spark and the detonation would likely be too close in time to
be told apart, and the boom is far louder.
Joe Gwinn
On 9/29/2023 8:45 AM, Joe Gwinn wrote:
On Thu, 28 Sep 2023 15:55:39 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/28/2023 3:19 PM, Joe Gwinn wrote:
On Wed, 27 Sep 2023 16:07:16 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/27/2023 1:05 PM, Leon Fisk wrote:
Hi,
Interesting news article on the power of leaking acetylene?
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a >>>>>> vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were >>>>>> damaged as a result of the blast, Ottawa County sheriff’s deputies said. >>>>>>
Allendale Township firefighters and deputies responded to a 6:30 a.m. >>>>>> report of an explosion Wednesday near 68th Avenue and Sunset Drive in >>>>>> Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car >>>>>> overnight. Investigators determined the explosion was triggered either >>>>>> when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
I have been told more than a certain volume of acetylene in "free air" >>>>> can self detonate or detonate from turbulence. I had an accident here >>>>> at the shop some years back where there was no apparent source of
ignition. Just somebody in open air sticking their hand in front of the >>>>> flow the flow from a cracked valve. There was no physical contact, and >>>>> no obvious source for static. I mentioned it in this group not long >>>>> after it happened. Gunner and a few others told me there had to be an >>>>> ignition source, but I was standing right there. In fact I was reaching >>>>> towards the valve to shut it off when it ignited. Then we had a blow >>>>> torch pointed at the corner of my shop building. I went back in the >>>>> shop to grab a welding glove so I could shut it off.
The person with their hand in front of the valve got burned, but not as >>>>> badly as you might think. Their whole hand was red, and the outer
layers of skin all sloughed off over the next few days. They got their >>>>> hand out of the fire pretty quick. Worse than a regular first degree >>>>> burn, but not the worst burn I've seen called a second degree burn. It >>>>> was mostly bad because it was over their whole hand.
We could argue about whether it was an explosion or a conflagration. It >>>>> had a pretty healthy pop for an uncontained event. Faster than a
whoomp, but maybe not quite a crack.
What was the humidity then?
I'd bet on an unnoticed ESD (electro-static discharge), which can be
caused by the air causing things to flutter against one another.
Just walking across a carpet can generate enough static electricity to >>>> make a sharp crack sound.
Joe Gwinn
Standing on concrete outside in one of the driest climates on earth. I
wear rubber sole shoes pretty much all the time. Either sneakers or
walking boots. The OP usually wears rubber sole shoes as well. I still >>> have very good discrete hearing. (I still have my high frequency
hearing as well.) The only sound I heard was the detonation. Its
possible, but it sure didn't seem like it.
The ESD spark and the detonation would likely be too close in time to
be told apart, and the boom is far louder.
Joe Gwinn
So how for does the invisible arc jump. His hand was 8-10 inches away.
It wasn't me. My hand was maybe 6 inches away, and I felt no static
pop. The only time I've seen a normal static arc jump much longer than
an inch or so was in extreme circumstances. Arc gap generators, St
Elmos fire discharging off an antenna cable in a fog on boat. That sort
of thing. In those cases it was quite visible.
Maybe you are right, and I am full shit, but the detonation happened at >exactly the moment the OPs hand broke the flow from the valve. I was so >surprised that I spent quite a bit of time researching it to see what
could have caused it. There was no obvious arc source. Not even a
nearby motor starting up. Closest motor was the AC heat pump condensing
unit about 15 feet away and it was not running.
Is acetylene gas conductive?
I guess if it is that could have provided
the "invisible" arc path. I am aware that vulcanisates of acetylene
black are conductive, but I can't find anything that specifically says >acetylene gas is.
That acetylene "can" detonate from when certain conditions are met not >necessarily requiring a spark is established. Whether or not that is
what happened when a bottle turned into a blow torch outside my shop we
will never know for sure. I have no desired to perform experiments to
prove it one way or another. Okay maybe a little but I am not yet
senile enough to let my curiosity over ride my common sense.
"Jim Wilkins"Â wrote in message news:uf7hm2$fkfd$1@dont-email.me...
"Bob La Londe"Â wrote in message news:uf7egr$ek85$1@dont-email.me...
So how for does the invisible arc jump. His hand was 8-10 inches away.
It wasn't me. My hand was maybe 6 inches away, and I felt no static
pop. The only time I've seen a normal static arc jump much longer than
an inch or so was in extreme circumstances. Arc gap generators, St
Elmos fire discharging off an antenna cable in a fog on boat. That sort
of thing. In those cases it was quite visible.
------------------------
I Googled to see if the flow of an insulating gas could transfer charge
like
the belt of a van de Graaff generator and what I found was that it has to contain particles, clean gas won't.
I thought I remembered a small shock from operating air tools.
This says yes: https://www.eevblog.com/forum/chat/does-air-compressor-produce-esd/
"Bob La Londe"Â wrote in message news:uf7egr$ek85$1@dont-email.me...
So how for does the invisible arc jump. His hand was 8-10 inches away.
It wasn't me. My hand was maybe 6 inches away, and I felt no static
pop. The only time I've seen a normal static arc jump much longer than
an inch or so was in extreme circumstances. Arc gap generators, St
Elmos fire discharging off an antenna cable in a fog on boat. That sort
of thing. In those cases it was quite visible.
------------------------
I Googled to see if the flow of an insulating gas could transfer charge
like the belt of a van de Graaff generator and what I found was that it
has to contain particles, clean gas won't.
I thought I remembered a small shock from operating air tools.
On 9/29/2023 3:04 PM, Jim Wilkins wrote:
"Bob La Londe"Â wrote in message news:uf7egr$ek85$1@dont-email.me...
So how for does the invisible arc jump. His hand was 8-10 inches away.
It wasn't me. My hand was maybe 6 inches away, and I felt no static
pop. The only time I've seen a normal static arc jump much longer than
an inch or so was in extreme circumstances. Arc gap generators, St
Elmos fire discharging off an antenna cable in a fog on boat. That sort
of thing. In those cases it was quite visible.
------------------------
I Googled to see if the flow of an insulating gas could transfer
charge like the belt of a van de Graaff generator and what I found
was that it has to contain particles, clean gas won't.
I thought I remembered a small shock from operating air tools.
We are getting pretty far out in the weeds here. I don't recall ever getting zapped by air tools, but wood shop guys have to discharge
static on dust collection systems. Lots of particles there though. I wonder if the minimal oil from the compressor and/or air tool oil
counts as enough of a particle to create static build up. Maybe if
using some types of plastic whip lines and an oiler at the wall
instead of oil dispensed directly into the tool...
On 9/29/2023 8:45 AM, Joe Gwinn wrote:
On Thu, 28 Sep 2023 15:55:39 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/28/2023 3:19 PM, Joe Gwinn wrote:
On Wed, 27 Sep 2023 16:07:16 -0700, Bob La Londe <none@none.com99>
wrote:
On 9/27/2023 1:05 PM, Leon Fisk wrote:
Hi,
Interesting news article on the power of leaking acetylene?
https://www.mlive.com/news/grand-rapids/2023/09/explosion-in-allendale-injures-1-damages-vehicles.html
===
OTTAWA COUNTY, MI – Police believe a leaking cutting torch stored in a >>>>>> vehicle’s trunk caused an explosion early Wednesday morning.
A 21-year-old Allendale woman suffered minor injuries and two cars were >>>>>> damaged as a result of the blast, Ottawa County sheriff’s deputies said. >>>>>>
Allendale Township firefighters and deputies responded to a 6:30 a.m. >>>>>> report of an explosion Wednesday near 68th Avenue and Sunset Drive in >>>>>> Allendale.
Police said a leaking acetylene torch was stored in the trunk of a car >>>>>> overnight. Investigators determined the explosion was triggered either >>>>>> when the electric release was used or when the trunk was opened.
There was also damage reported to the garage’s structure.
I have been told more than a certain volume of acetylene in "free air" >>>>> can self detonate or detonate from turbulence. I had an accident here >>>>> at the shop some years back where there was no apparent source of
ignition. Just somebody in open air sticking their hand in front of the >>>>> flow the flow from a cracked valve. There was no physical contact, and >>>>> no obvious source for static. I mentioned it in this group not long >>>>> after it happened. Gunner and a few others told me there had to be an >>>>> ignition source, but I was standing right there. In fact I was reaching >>>>> towards the valve to shut it off when it ignited. Then we had a blow >>>>> torch pointed at the corner of my shop building. I went back in the >>>>> shop to grab a welding glove so I could shut it off.
The person with their hand in front of the valve got burned, but not as >>>>> badly as you might think. Their whole hand was red, and the outer
layers of skin all sloughed off over the next few days. They got their >>>>> hand out of the fire pretty quick. Worse than a regular first degree >>>>> burn, but not the worst burn I've seen called a second degree burn. It >>>>> was mostly bad because it was over their whole hand.
We could argue about whether it was an explosion or a conflagration. It >>>>> had a pretty healthy pop for an uncontained event. Faster than a
whoomp, but maybe not quite a crack.
What was the humidity then?
I'd bet on an unnoticed ESD (electro-static discharge), which can be
caused by the air causing things to flutter against one another.
Just walking across a carpet can generate enough static electricity to >>>> make a sharp crack sound.
Joe Gwinn
Standing on concrete outside in one of the driest climates on earth. I
wear rubber sole shoes pretty much all the time. Either sneakers or
walking boots. The OP usually wears rubber sole shoes as well. I still >>> have very good discrete hearing. (I still have my high frequency
hearing as well.) The only sound I heard was the detonation. Its
possible, but it sure didn't seem like it.
The ESD spark and the detonation would likely be too close in time to
be told apart, and the boom is far louder.
Joe Gwinn
So how for does the invisible arc jump. His hand was 8-10 inches away.
It wasn't me. My hand was maybe 6 inches away, and I felt no static
pop. The only time I've seen a normal static arc jump much longer than
an inch or so was in extreme circumstances. Arc gap generators, St
Elmos fire discharging off an antenna cable in a fog on boat. That sort
of thing. In those cases it was quite visible.
Maybe you are right, and I am full shit, but the detonation happened at >exactly the moment the OPs hand broke the flow from the valve. I was so >surprised that I spent quite a bit of time researching it to see what
could have caused it. There was no obvious arc source. Not even a
nearby motor starting up. Closest motor was the AC heat pump condensing
unit about 15 feet away and it was not running.
Is acetylene gas conductive? I guess if it is that could have provided
the "invisible" arc path. I am aware that vulcanisates of acetylene
black are conductive, but I can't find anything that specifically says >acetylene gas is.
That acetylene "can" detonate from when certain conditions are met not >necessarily requiring a spark is established. Whether or not that is
what happened when a bottle turned into a blow torch outside my shop we
will never know for sure. I have no desired to perform experiments to
prove it one way or another. Okay maybe a little but I am not yet
senile enough to let my curiosity over ride my common sense.
--
Bob La Londe
CNC Molds N Stuff
In the 70s, I once visited a blacksmith shop that had an oxy tank on a
dolly with an carbide/acet generator apparatus.
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