Handy man's workshop and laboratory . s the last molecule of sulphurous aciddisappears, the whole solution turns blue so quickly that onelooks twice before believing. The blue color generally flashes infrom 20 to 40 seconds, depending upon the concentration andstrength of the solutions. With a little experimenting the solu-tion may be made to change in a predetermined time. It is agood idea to use a small part of the solution, and time it before 2l6 HANDY MANS WORKSHOP AND LABORATORY mixing the remainder. Care should be taken not to use too muchsulphurous acid.—59 NOVEL HEAT MOTOR Owing to the
Handy man's workshop and laboratory . s the last molecule of sulphurous aciddisappears, the whole solution turns blue so quickly that onelooks twice before believing. The blue color generally flashes infrom 20 to 40 seconds, depending upon the concentration andstrength of the solutions. With a little experimenting the solu-tion may be made to change in a predetermined time. It is agood idea to use a small part of the solution, and time it before 2l6 HANDY MANS WORKSHOP AND LABORATORY mixing the remainder. Care should be taken not to use too muchsulphurous acid.—59 NOVEL HEAT MOTOR Owing to the fact that water in liquid form is nearly incom-pressible, it cannot be used to perform a cycle of operations suchas take place in the steam engine. Theoretically, however, anysubstance having a temperature above its surroundings is capableof serving as a power generator. Disregarding the possibility ofthermo-electric conversion of energy, useful mechanical work canbe derived through the expansion of vapors of volatile Fig. 18S—A simple heat motor Many liquids are known to pass into vapor under a feeble heatrsuch as, for instance, the suns rays. If other media than water are used as heat carriers, it becomesindispensable to recover the original liquid by means of conden-sation for economic reasons. A simple apparatus, which can be made by the Handy Man,will demonstrate that a very small degree of heat is sufficient forperforming light mechanical work. A disk E, mounted on shaft D, serves as support for six com-partments, Blt B2, . r B6, concentrically arranged about D. These HANDY MANS WORKSHOP AND LABORATORY 2\J as well as the disk can be made of tin soldered together. Twoopposite chambers, for instance, Bx and B±, are connected by asmall brass tube C, bent outward at the center to clear the shaftD and projecting through the chambers nearly to the outer cylin-drical wall. Two uprights, Fx and F2, support the wheel at aproper distance over a small flame A or
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Keywords: ., book, bookcentury1900, bookdecade1910, booksubjectworkshoprecipes
