340 



SCIENCE OF HOME AND COMMUNITY 



2. Make a study of the parts of a dissectible telephone. 

 Make a drawing and explain the use of each part. 



Central. One of the most interesting parts of a telephone 

 system is the central station, where connections are made 



. for different sub- 



. scribers. When a 

 subscriber takes his 

 receiver from the 

 hook, a little lamp 

 glows opposite the 

 hole that is marked 

 with this person's 

 number ; this is a 

 signal to the operator 

 that some one wishes 

 a connection made. 

 The operator's re- 

 ceiver and transmit- 

 ter are fastened to 

 her head and neck, so 

 that both her hands 

 are free. She con- 

 nects her wire with 

 the subscriber's by 

 means of a plug, and 

 having found the de- 

 sired number makes 

 the necessary connec- 

 tions. This is done 

 by inserting a plug 



connecting with the first subscriber's telephone into a hole 

 connecting with the second subscriber's telephone. By 

 pressing a button she causes a bell to ring on the second 

 subscriber's telephone. When the second receiver is taken 



FIG. 141. Central making connections. Each 

 dot on the board is a subscriber's connection. 

 The cords connect one subscriber with another. 

 The switches for operator's phone and the pilot 

 lamps showing when a subscriber wishes a con- 

 nection are set in the table. 



