Page:Popular Science Monthly Volume 92.djvu/295

 44

��Ninety Degrees" says the Regulator

��And that will be the unchang- ing temperature of your bath

��XT the top of the contrivance here A\ illustrated, a little lever sUdes over a small, circular and graduated scale. Set this lever at any point you like — the scale reads in degrees Fahren- heit — open a valve and forthwith your bath water comes out at the right temperature. Once having set this lever, you may let the water run an hour or more; in fact, any length of time, and still the temperature re- mains unchanged — this in spite of the fluctuation in

the supplies of hot and cold water fed to the contrivance. And hot and cold sup- plies do fluctuate, as anyone who has ever stood under a shower bath knows. Alternate freezings and scaldings are not pleasant.

The illustra- tion shows the principal work- ing parts and their functions. The big cyhndri- cal coils of the machine are made of two un- like metals weld- ed or riveted to- gether to form a thermostat. The metals expand or contract with changes in tem- perature very much as does the hairspring on a watch at each tick. The regulating lever at the top con-

���Even the baby enjoys a bath in which the temperature of the water does not change. Look at the happy expression on his face

��BEGTJLATIN'G LHT^TR CONTROLS TF-MPERATUHB OF ■WATER

��TEMPERATimZ SCALE

��SWINGING YOKE GEAR OPERATED BY MOVEMENTS OF COILS

��Pn'OT ON WHICH BALANCED VALVE SWINGS

��HOT WATER INLET

���The principal parts of the water regulator and their functions. There are six metal thermostat coils

279

��trols the amount of this expansion or contraction just as does the "fast" and "slow" lever on a time-piece. Thus the temperature of the water is con- trolled. The mo- tion of the spirals with changes in temperature are passed along to the balanced valve at the bottom of the machine by means of a yoke hidden in the interior. As a result of the thermostat's ac- tion, the balanced valve can open the hot and cold water supplies only to the right degree and proportion necessary to produce the temperature desired.

The machine is of great use in hospitals where many baths of widely varjdng tem- perature must be given to patients.

Laundries also find the con- trivance of value in control- ling the hotness of water used on fine fabrics.

Several sizes are manufac- tured, from a small one suited to the home, to others of large capacity adap- ted to the needs o f sanitariums, hotels, Y.M.C. A.'s, and similar users. Having only a lever to set, and a valve to open, the ma- chine is easily operated.

��VALVE WHEEL CONTROLS AMOUNT OF WATER

��DASH POT CONTROLLING MOVEMENTS OF COILS

BALANCING YOKE OPERATED BY THERMOSTAT THROUGH GEAR

VAXVES LINKED TO BALANCING YOKE. THEREBY

SENSITIVE TO

ALL MOVEMENTS OF COLLS

��COLD WATER INXET

�� �