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

227 APPENDICES. (Appendix to page 66.) The Chapter on “ Fuels ” mentions a few combustibles that suggest themselves for use with sea water distilling machinery. The heating powers attributed to them are to some extent approximate, yet quite near enough a guide to compare their heating capacities when working this class of machinery. If greater accuracy is desired, reference should be made to the Treatise on Heat, by Mr. I\ Box, in whose book will also be found fuller informa- tion on fuels and on heat generally. (Appendix to page 96.) With regard to Table L—Péclet, in his Traite de la Chaleur, gives the rule that when a substance with parallel surfaces (i.e., of uniform thickness) has a constant flow of heat passing through it, with a constant difference of temperature between the two surfaces, such flow is in inverse ratio to the distance the two surfaces are apart (i’.e., to its thickness). Péclet then gives the following formula :— Let M = Amount of heat passed through in a specified time (i.e., units of heat). t = Temperature of one surface.