Fig. 42.—Section through a dry gas-meter.
In many cases, where the employment of non-freezing liquids is necessary, the dry meter may be used to
advantage, since all such liquids have more or less corroding effect on sheet lead and even tin, depending upon the composition of the gas.
Fig. 43.—Section through a dry gas-meter.
The dry meter comprises two bellows, operating in a casing divided into two compartments by a central partition. The gas is distributed on one or the other side of the bellows, by slides B. The slides B are provided with cranks E, controlled by levers M, actuated by transmission shafts O, driven by the bellows. The meter is adjusted by a screw which changes the throw of the cranks E and consequently affects the bellows.
The movement of the crank-shaft D is transmitted to the indicating apparatus. In order to obviate any leakage, this shaft passes through a stuffing-box, G. The diagrams (Figs. 42-43) show the construction of a dry meter, the arrows indicating the course taken by the gas.
Fig. 44.—Rubber bag to prevent fluctuations of the ignition flame.
