1/2.1921 1/4.194.753 1/23/1612.5
5/8.08.07271 1/4.2563 1/21/415
5/8.0911 1/2.143.53 1/25/1618.5
5/8.131.51 1/2.174.253 1/23/822
3/4.101.251 3/4.1754 1/23/1614
3/4.121.751 3/4.216.54 1/21/418
The first attempts in this direction were by Alderson in England, who patented his invention in 1804, which consisted in putting an interior casing of tin pipe within the leaden one.
Dobbs, in 1820, gave a coating of resin to the lead pipe, and then placed it in a mold, a core being also placed in the center, or axial position.
Tin was then cast upon it and within it, the two becoming perfectly united.
It is then ready for drawing or rolling, whichever may be preferred.
Warner treats the lead pipe with resin, so as to encourage the jun
as to be uninjurious, yet it is found in practice that, owing to various causes, all water used for domestic purposes containing air and more or less mineral impurities, the water after its passage through lead pipes is found to become charged to a greater or less extent with the poisonous salts of lead.
Tin is much less subject to be thus acted on, and its salts are comparatively innocuous.
The earliest attempt to remedy this evil by lining the tin pipe with lead appears to be found in Alderson's English patent of January 26, 1804.
Machine for making tin-lined lead-pipe.
In this the lead was cast around a core or mandrel in a twopart mold, the mandrel was then withdrawn and replaced by a smaller one, around which the fused tin was poured.
A reversal of the process was provided for, the tin lining being first cast, and the lead afterward poured around it. The compound pipe was afterward lengthened by being drawn out upon a mandrel.
A method of drawing out the tin lining upo