50 HEAT 



your real name or yonr nickname ; that is, 32 degrees 

 Fahrenheit and degrees Centigrade are the same tem- 

 perature. The temperature of boiling water is also the 

 same although it is called 212 degrees Fahrenheit and 100 

 degrees Centigrade. If you do not state whether the tem- 

 perature is according to the Fahrenheit thermometer or 

 the Centigrade thermometer, it is understood to be the 

 Fahrenheit. Degrees are marked the same as the degrees 

 of a circle, that is, in the place of writing 60 degrees Fah- 

 renheit we may put 60 F. 



Experiment 26. How to Read a Thermometer. 

 Apparatus: Cheap thermometer. 



a. Count the number of divisions between the fig- 

 ures 40 and 50. How many spaces are there? What 

 is the difference between 40 and 50? Then how many 

 degrees does each space mark? All thermometers are 

 not marked the same and you should find out every 

 time you use a thermometer just how many degrees are 

 covered by each space. 



b. Obtain the temperature of the room. To do 

 this the thermometer should come to rest, that is, there 

 should be no difference between two readings taken two 

 or three minutes apart. The temperature of a room 

 should be 65 to 68 degrees Fahrenheit at the same height 

 as the heads of those sitting. If the temperature out- 

 doors is more than 68 degrees the temperature indoors 

 may be uncomfortably high, but we should try to keep 

 the temperature at 68 degrees. 



c. Take the outdoor temperature in the morning 

 just before school begins, at noon, and at the close of 



