128 



GAS-METER. 



area of the latter being greater than the inlet, to ensure perfect freedom of 

 action. The dotted lines show the wrap of the hoods. The woodcut represents 

 a view of the front or inlet side of the drum, with the convex cover removed. 

 The outlets will present the same appearance, but of course reversed. By re- 

 ferring to Fig. 29. the remaining parts will be understood. The direction of 



Fig. 29. 



the gas is marked by arrows. The box a, in which the inlet-valve is con- 

 tained, is soldered tight, having no communication with the rest of the case, 

 except through the valve, the position of which is shown by the arrows ; b is 

 the inlet-pipe projecting above the water-line, conveying the gas into the 

 meter by the bent arm c, rising above the water between the convex cover 

 and the inlet-hoods ; d is a float attached to the inlet-valve, adjusted so, that 

 when the water falls below the centre opening, the valve will close and the 

 gas cease to enter the meter. 



