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



known as the contact chamber. This chamber contains the 

 mechanism for making the contact which indicates the revolu- 

 tions of the cups. The construction and arrangement of i><>th 

 the contact chamber and the mechanism contained in it depend 

 on whether the indicating device is penta-count electric, 

 single-count electric, or acoustic. 



When the penta-count electric indicating device is used. ili<- 

 contact chamber (10) which is closed by a screw cap (11), 

 provided with a leather gasket for keeping out the water, is held 

 by a >lulini: lit in the upper end of the yoke, and is clamped 

 in position by a set-screw. In the contact chamber there is 

 iiit(l a cylindrical plug (12) which is held in position by a 

 screw and carries a gear-wheel (13). This engages the worm 

 gear on the upper end of the cup shaft, the gearing being so 

 arranged that the wheel makes one revolution for every twenty 

 revolutions of the cups. On the side of the wheel are four pins, 

 equally spaced and set so that they will strike the contact spring 

 (14) at each fifth revolution of the cups, thus closing the elec- 

 tric circuit to the indicating device, explained later. These 

 contact parts are known as the contact wheel, the contact pins, 

 and the contact spring. The contact spring is carried by the 

 contact plug (15) which is screwed into the contact chamber 

 through a hard-rubber bushing (16) that insulates the CODI.K I 

 spring from all other parts of the meter when it is not touching 

 one of the pins on the contact wheel. In the outer end of the 

 contact plug there is a hole and a set-screw for connecting one 

 wire from the indicating device. 



When the single-count electric indicating device is used, the 

 contact chamber (lOa) and appurtenances are the same as 

 described for the penta-count contact chamber, with the excep- 

 tion that the gear wheel (13) is omitted and the worm gear on 

 the upper part of the shaft (4) is replaced by the eccentric (4a) 

 that strikes the contact spring (14a) at each revolution, thus 

 closing the electric circuit to the indicating device. The penta- 

 and single-count contact chambers are interchangeable. 



The electric indicating device is used when the meter is 

 suspended from a meter cord attached to the stem (23), or is 

 held by a rod either screwed into the coupling (57), or sliding 

 through the connection (54). 



