24 



aquatic JLitt 



the thermostat will be observed a case 

 on the face of which is set a dependable 

 thermometer. The small pointer at the 

 bottom is a lever which enables one to 

 set the instrument for any desired tem- 

 perature, from 55 degrees to 85 degrees 

 Fahrenheit. 



The clock, in addition to being an ac- 

 curate timepiece, has an added function. 

 It may be desirable at times to maintain 

 a slightly lower temperature, especially 

 during the night. This can be accom- 



Fig. 4 

 plished by setting the lever at the bottom 

 to the desired degree, then setting the 

 clock to a determined hour, say 6 A. M., 

 at which time the clock will automatically 

 throw the lever to 70 degrees, and by the 

 time we are ready to come to the con- 

 servatory the fire will be burning brightly, 

 may be fixed for the day, and the place 

 is warm. A type is manufactured with 

 an eight-day clock which will not only 

 throw the lever forward in the morning 

 at any desired hour, but at night will 

 reverse the operation and set it back 

 again. The thermostat may also be had 

 without the clock. 



The thermostat, as previously stated, is 

 connected with the motor by a cable of 

 three fine wires, the electric current being 

 furnished by two dry cells. The gravity 

 type of motor is illustrated by Figure 4. 



With this type it is necessary to pull up 

 the weight each day. Spring motors 

 operating for a week, and electrical mo- 

 tors which require no attention, can also 

 be procured. 



Assuming that a temperature of 75 de- 

 grees is desired, the apparatus will keep 

 the drafts on until this is reached, and 

 then without human aid, automatically 

 check the fire until the temperature drops 

 to 74 degrees, when the drafts will again 

 be opened. To say nothing of its almost 

 human intelligence and convenience, the 

 saving in fuel is a big item. It can be 

 readily seen that the fire is not allowed 

 to burn, perhaps for hours, after the 

 place has been sufficiently heated. Nor 

 will it allow the fire to go down and per- 

 haps out on a cold night. A sudden drop 

 in the temperature at any hour is cared 

 for without any torethought on the part 

 of the owner. 



Figure 3 illustrates in detail the appli- 

 cation of the apparatus to a hot-water 

 heater, while the same connections ex- 

 actly would be made for a hot-air 

 furnace. Figure 1 shows its application 

 to a rather elaborate gas connection, but 

 it can be equally well arranged to operate 

 with a single gas burner. 



The motor is so equipped in the spring 

 and gravity types that it cannot run down 

 and leave the fire on should one forget 

 to wind the spring or pull up the weight, 

 as the case may be. The last act of the 

 motor, before automatically cutting off 

 the electric current, would be to shut off 

 the fire. Winding the motor, or pulling 

 up the weight, will reconnect the current, 

 and the operation of the regulator will 

 proceed as before. 



The installation of this simple outfit 

 renders the possibility of temperature 

 changes very remote indeed. It is an 

 almost indispensable accessory of the 

 conservatory for fishes. While many 

 makes are obtainable, that manufactured 



