Movement 483
AnimatedOriginal 

483. Dry gas meter. Consists of two bellows-like chambers, A, A', which are alternately filled with gas, and discharged through a valve, B, something like the slide-valve of a steam engine, worked by the chambers, A, A'. The capacity of the chambers being known, and the number of times they are filled being registered by dial-work, the quantity of gas passing through the meter is indicated on the dials.

免费欧洲美女牲交视频_免费人成在线观看网站_免费岛国片在线观看x片喷水