. Rules and practice for adjusting watches . prights with a thumb-screw on the top, under each of which a wire ter-minates. F. Is the compensating bar, one end of whichis fastened solidly to D with rivets. The opposite end is free and rests against the endof a thumbscrew which passes through E. The thumbscrew is to be adjusted so that thefree end of F will rest against it in a temperatureof 70° Fahr. or any lower temperature. As thetemperature rises the free end of the bar movesaway from the end. of thumbscrew, breaking thecircuit and extinguishing the light, which cuts offthe source of heat.
. Rules and practice for adjusting watches . prights with a thumb-screw on the top, under each of which a wire ter-minates. F. Is the compensating bar, one end of whichis fastened solidly to D with rivets. The opposite end is free and rests against the endof a thumbscrew which passes through E. The thumbscrew is to be adjusted so that thefree end of F will rest against it in a temperatureof 70° Fahr. or any lower temperature. As thetemperature rises the free end of the bar movesaway from the end. of thumbscrew, breaking thecircuit and extinguishing the light, which cuts offthe source of heat. As the temperature decreasesthe bar again comes into contact and creates thecircuit. This bar can be made of various compensatingmetals, one combination of which is a strip of zincabout six inches long by three eighths of an inchwide and one thirty-second of an inch thick. On theoutside of this soft solder a strip of tin six inchesor a trifle less in length, by one fourth inch wideand one thirty-second of an inch thick. Both CIO) Jcr=&. Equipment for Temperature Adjusting metals should be bent to a curved form before theyare soldered together as shown in the cut. It is generally preferable to have the bar taper toa slightly narrower width at its free end, and near this free end it is neces- sary to solder a smallstrip of platinum at thepoint where the end ofthumbscrew comes incontact. G, H, I andJ are ventilating holesone inch in diameter andcovered by a swingingslide so that the holescan be opened or closedas desired for regulatingthe ventilation. a shelf of brass screenlocated about five inches from the top and on which the watches and a ther-mometer are placed in testing. L. Is a handle for the purpose of conveniencein carrying the box. The front is to be enclosed bya door made in two parts, the upper section ofwhich is glass which will admit of observing thethermometer. Proper adjustment of the thumb-screw and bar makes the box ready for use. I 9. The Lower Temperatur
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