echanism is suspended have appeared from time to time both consisting of the recording or indexing- in the character of the readings during operation and manipulations during gear and hand. It is apparent that pressure in the manufacture. receptacle is simultaneous in the tube, The accompanying… … ble to improve on. The case is one where one idea covers the whole field. Fig. I is the tube alone with no re- However, numerous modifications of cording-gear attached. the original Bourdon-Ashcroft gage Fig. 2 is a cross-section of the tube have been and are being invented and through A, B, or any…
Engineering
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten14unit-660-0.webp)
