. Wright's book of poultry, revised and edited in accordance with the latest poultry club standards. State IncubatorCo. surmounted this real trouble entirely in thecase of their thermostats, which are composedof iron and hard brass (perhaps the most sus-ceptible to rust of all metals), by tinning bothmetals separately before they are put together,and clipping the bars again into a bath ofmelted tin after they are riveted patents are numerous ; but we havenot found very much of note, and will contentourselves with show-ing, in Fig. 42, that usedin the now well-known Cyphers in
. Wright's book of poultry, revised and edited in accordance with the latest poultry club standards. State IncubatorCo. surmounted this real trouble entirely in thecase of their thermostats, which are composedof iron and hard brass (perhaps the most sus-ceptible to rust of all metals), by tinning bothmetals separately before they are put together,and clipping the bars again into a bath ofmelted tin after they are riveted patents are numerous ; but we havenot found very much of note, and will contentourselves with show-ing, in Fig. 42, that usedin the now well-known Cyphers thermostatic bar F, of which there are two,is about twenty-four inches long (or the wholewidth of the chamber) and composed of a stripof steel with its two edges bent downwards atright angles : this is to make the steel rigid, and THE BOOK OF POULTRY. enable it to resist all bending strains. To theends of the steel are firmly riveted, on both theupper and under sides, strips of aluminium, whichexpands more than the steel when heated. Thealuminium is kept flat down to the steel for a. Fig. 42.—Cyphers Thermostat. certain distance from the ends by sliding ties orrivets, which allow it to slide along, but not torise ; thus the expansion is all thrown towardsthe centre, where the aluminium is not tied, andrises into a bow. The action, therefore, consistsof four of these bows expanding with the heat,and the superiority of this thermostat consists inthe strength and definiteness of the motion, andrigidity of the whole, just as in the capsuleregulator. For the rest, the point of resistanceis the nut B at the end of the rod J, the upper-most aluminium bow G lifts the tube C, sliding onthe rod J and through the casting A. Themotion is thus convc)-ed to knife-edges liftingthe lever H with its valve E, the lever alsoworking on knife-edges at I, and furnished atthe other end with an adjusting weight D. There is yet another point in regard to heat-regulation. In some machines
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectpoultry
