s seats. Mr. Joseph Cragg, Inspector of Steamboats, to examine and then one and a half pints more water poured into it, The The main peculiarities of this valve are in its having a double copper vessel, which must be perfectly clean is now to be held test it. As will be seen from that part of the… … two to three minutes, when it overcome ; and that it would add becomes green. One pint and to the safety of boilers on board of DOUBLE SEATED LOCK SAFETY VALVE. a quarter of rain water is now steam vessels.” ‘to be added to the solution. The metal is now held over a single disk valve. By reference…
Internet Archive · Public domain (published before 1931). Free to use for anything.
