Flat glass is almost exclusively "Float Glass" now.
Developed in the 50's, glass is molten on the surface of a pool of lead, tin, or other fairly low melt point metal, and drawn off as an extrusion.
https://www.youtube.com/watch?v=JMGkbrETU8M
Flat glass is almost exclusively "Float Glass" now.
Developed in the 50's, glass is molten on the surface of a pool of lead, tin, or other fairly low melt point metal, and drawn off as an extrusion.
https://www.youtube.com/watch?v=JMGkbrETU8M
Very large tooling sheets. Ship bow plate etc, requiring extreme tensil strength.
Ship bow plate made from Float glass?? #521
Ralph
The front fell off!
Is 2,000 F the temperature of the glass or is the temperature of the tin, because it seems awfully hot for tin.
I think 2,000 F is the temperature of the glass when it starts to flow over the tin and it when gets pulled off at the end it has dropped below 1,200F and solidified. Unfortunately I have no idea of what temperature the tin is held.
Low type lever shear. Mesta Machine Company. 1905-1925.
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wow what a chomper!!!
On its way to get a crank and rods...
Wonder how long that 4" x 4" holds up?
Ralph
Typical MESTA sized product; rail-car shown for scale.
In regard to original post # 527;
There are indeed a few rail cars in the distance, but, there is also a railcar UNDER the shear. Only that shear sitting on a flat bed rail car.
It is a pretty large shear.
Planer at the McKees Rocks Machine and Erecting Shop. McKees Rocks, Pennsylvania. 1904.
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Takes me back...to the 70's anyway. Ran a 30' Gray gantry planer. Talk about working carefully, a week of planing, then a mistake could be 30 feet long.
Also ran a 8' Rockford. Talk about working carefully; you know the rest.
Mesta Machine Company ship shaft department.
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The big shear on the right...
Good call! If not same, then another; many similarities. Talk about scale, Geez Louise.
The little wee tiny guy standing on the lathe.
When your tool post is as big as you are...you might be a Mesta worker...
Wheel press. Pittsburgh and Lake Erie Railroad Company. July, 1904.
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541
Reckon that's white lead being used to press those wheels?
#541 I wonder what they were keeping count of?
I painted 20ltrs of lead based paint on the deck of my boat, by hand with a paint brush yeh, I'm still here, also, like I suspect MANY other mechanics did in the sixties, removed brake drums and blew asbestos dust all over the workshop. If asbestos is the cause of mesothelioma. I should have died yeas ago. I'm convinced that most of this is disinformation designed to cover up something else. Suggested, but unprovable was the info that "they" could not surveil through asbestos. Well they clearly could not tell everybody to remove the asbestos from their rooves so that they could spy on you so they dreamed up a fear campaign to get folks to do it voluntarily.
If I had known I was going to live this long I would have taken better care of myself when I was younger.
I got AFU by the us government building a DOD 6-8 grade school on top if a toxic agent orange dump site 4 years befor I went to school there....then the slicing for$$ drs ****ed me up worse. nothing I did has ever afected me....aflected? well I do have a slight issue with racing..and horsepower...or the need for speed.& P
Lead paint, when fresh isn't very toxic, unless you're drinking it. The dangers with lead paint are primarily to the workers making it (the huge number of workers getting lead poisoning in paint manufacturing in the early part of the 20th century were the impetus for the first workplace exposure regulations. The other end of the pain life-cycle is the other danger point: when it is old and crumbling and gets turned into stuff you can ingest or inhale.
Asbestos is proven to be a cause of mesothelioma, probably the primary one, but all cancer is a matter of odds.
Consider spraying out those brake drums playing a game of russian roulette with a 10,000 round chamber. You could go for your entire life without catching the loaded one; but the more you spin that chamber, the more likely you'll catch the loaded one. This is why the createst number of cases are in miners and shipbuilders working with the stuff day-in and day-out.
And like the lead paint, the other end of the use, as old, crumbling insulation, roofing and siding is the most dangerous, because then you're being exposed any time you're in the house.
Even a 10,000 round chamber's gonna land on a live round sooner in that scenario.
Asbestos related diseases are much more than mesothelioma, and whilst brake dust (ground down asbestos plus the binding gripping resins that actually do the braking, asbestos being a high heat 'carrier') had the potential to cause it, it was much lower risk compared to raw asbestos or the fibrous asbestos used in insulation. My father who worked for Ferodo in the 50's was thought to have ingested asbestos and ended up with an asbestos gut cancer, which was successfully removed but not before it had micro-metastasized (or a tiny fraction got into his blood stream during the operation to remove it), he lived another 30 years before the now in his brain encapsulated tumour caused him to collapse. When removed the tumour was fist sized, and although he was starting to recover the 'old mans friend' (hospital acquired pneumonia) finished him off.
In the UK we have/had an asbestos related death compensation scheme, however it only applied to lung cancers/mesothelioma, so we were unable to claim any compensation for him or his funeral.
How many more tradesmen were exposed to asbestos by ingestion is unknown, but the practice of chewing 'Rawlplastic' rollable asbestos to dampen it before inserting it into holes when hanging shelves etc is thought to have contributed to the high asbestos related death toll amongst builders and other building related trades.
Being in the US, I had to search for 'Rawlplastic'.
I see that though now being made of plastic, they are still called 'Rawl' plugs.
Very interesting post, thank you.
Attachment 40379
I had a friend who died of mesothelioma and i found it fascinating that although the asbestos was inhaled the meso was OUTSIDE her lungs in the pleural space. Now the last time I looked, the lungs were airtight, so how did an asbestos fiber, much bigger than an air molecule get to be there?
Mesothelioma is defined as cancer of the tissues lining our organs; most commonly the pleural space around the lungs. Asbestos fibers can travel through the aveoli into surrounding tissues; in fact this is the reason it causes both mesothelioma and asbestosis, which is the mechanical scarring of lung tissues by inhaled asbestos fibers.
https://www.cancer.org/cancer/malign...k-factors.html
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Engine No. 10 at the Distribution Department, Arlington Pumping Station. Arlington, Mass., Apr. 7, 1908.
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Mesta Machine Company saw. 1905-1925.
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Do you think that sharpener automatically advances or does someone have to move the blade and lock it in place...
I am looking for something to give me a sense of scale and all I can see are the cabinet doors. I am guessing the blade to be about 4 foot diameter. I wonder how far wrong I might be.