18 W. & L. E. GURLEY, TROY, NEW YORK 



The set-screws for clamping the various sliding fits are all 

 of the same size and are of standard make. Beveled grooves 

 are provided in each of these connections, so that when the set- 

 screws engage them the parts are drawn into place. 



All parts of the meter are standard, and can readily be 

 replaced in the field. Parts should always be ordered by Shop 

 Number from the illustrations in the Price List. 



4. THE RECORDING OR INDICATING DEVICE. A recording 

 or indicating device is necessary for determining the number of 

 revolutions of the meter wheel, and the successful use of tin* 

 meter depends largely on this part of the apparatus. Various 

 devices, operated either on the mechanical, electric, or acoustic 

 principle, have been used for this purpose. These include the 

 telegraph ticker, automatic recorder, electric buzzer, telephone 

 receiver, drums, etc. Of these, however, the telephone receiver 

 and the acoustic indicator have been found to be most satisfac- 

 tory in general practice. 



The telephone attachment consists of a telephone receiver 

 (25) and small battery (26) placed in a partial circuit which 

 terminates in a connecting plug (27) by means of which tin- 

 apparatus can be readily connected in circuit with the meter. 

 The magnets of the telephone receiver are wound so as to secure 

 a loud click. 



The dry battery (26) is compact and can be replaced read- 

 ily. It is equipped with binding posts to receive the two wires. 



In use, the telephone receiver is fastened on the shoulder by 

 a large safety pin, or is held at the ear by an operator's head 

 band, which is worn under the cap, if preferred. The battery 

 cell is placed in the coat or trousers pocket. The connecting 

 plug (27) should hang below the shoulders and be easily acces- 

 sible for attaching and detaching the meter circuit. 



In the acoustic indicator, the striking of the hammer (50) 

 on the drum (49) in the contact chamber (lOb) indicates each 

 tenth revolution of the meter, as already explained. The sound 

 is transmitted through the rods (51) and a rubber tube to the 

 ear of the operator. The rubber end and ear-piece are not 

 necessary unless there is considerable noise. 



