January 22, 1910 



HORTICULTURE 



139 



TEMPERATURE 

 ALARMS 



Damage to greenhouse stock by too high or too low tem- 

 perature can be absolutely prevented by the use of a good 

 temperature alarm. 



With such a device when the temperature rises or falls 

 above or below a predetermined point a bell rings in any de- 

 sired place about the premises. 



Thermostatic Electric 



Alarm. Our Thermostatic Electric Alarm has a field of regu- 



lation between 30° and 120- and can be set at any point 

 between these two. Its accuracy is guaranteed and, as 

 it is constructed of the best materials and has no compli- 

 cated parts, it will last practically a life time. 



Style A is cast in aluminum and is 8 inches high, 4 

 inches wide, 2 inches deep and is highly finished. 



Differential 

 Temperature Alarm. 



This device will insure absolute prevention 

 against too high or too low temperature. It has a 

 range of regulation between 20° and 110° Fahrenheit 

 and can be set to ring a bell anywhere about the 

 premises when the temperature goes above or below 

 a designated point. Its sensitiveness and accuracy 

 we guarantee, as it is made of the best materials 

 obtainable, and contains no complicated parts. The 

 care in manufacturing, the design used, and the 

 materials employed enable us to make a temperature 

 alarm unequalled by any similar device. 



Temperature 

 Alarm Number 2. 



For ringing an alarm only when the temperature 

 goes too low, our Temperature Alarm No. 2 is best 

 adapted. This device is connected with an electric 

 bell and battery and will sound an alarm anywhere 

 about the premises when the temperature fails below 

 a previously determined point. It registers from 

 20° to 120° and the pointer can be set at any figure 

 between these two. When so set it is guaranteed 

 to give the alarm. The casing is made of sheet 

 aluminun, size 4 inches diameter by ij^ inches 

 high. 



Differential 

 Temperature Alarm. 



Agencies wanted to handle our goods. 

 Progressive, energetic and reliable 

 firms preferred. 



National Clock & 

 Electric M'f g. Co. 



Saint Louis, Mo. 



Temperature 

 Alarm Number 2. 



