A Practical Manual On Sea Water Distillation
With A Description Of The Necessary Machinery For The Process

198 SEA WATER DISTILLATION. (3) A water gauge for indicating the water level. (4) Test cocks (if required) for same purpose. (5) A steam gauge. (6) A feed check valve. (7) A blow-off cock. (8) An air cock at the highest point of boiler. 58. These fittings are always included with the boiler, and are usually detailed in the boiler specification. The heating surface and grate surface are also specified. Such parts as furnace doors, soot doors, dampers, &c., also a spare set of fire bars, should be included, and supplied with the boiler. Note.—Boiler makers of repute will supply detailed drawings of the boiler they offer. It is an excellent plan, when ordering a boiler, to specify that its construction shall be under the supervision of a Boiler Insurance Office. Thus, the Ocean Accident Corporation (for quite a small fee) undertake to supervise the construction of a boiler, and see that the construction answers all rules and regu- lations. A certificate given by an insurance office of repute will always be taken as sufficient to show such regulations have been complied with. The details of boiler construction required by the Board of Trade, Bureau Veritas, Lloyds, and Admiralty will be found in Seaton and Rounthwaite’s Pocket-book. 6. The Chimney. 59. The chimney is usually considered an extra, but it should be supplied, and, if the chimney is an iron struc- ture, guy chains also. In the matter of size and height of chimney, this is usually left to the boiler maker to