t bring a full course of light with as little heat as possi- with segmental slot engaged by a bolt on the slide, so ble to the object to be exhibited. The distinguishing chain may be operated by the treadle to propel the that when the nut of the bolt is loosened the lever feature of this projection… … one floor only of a building, and which GOULD'S ROTARY ENGINE. may be readily moved to various posi- tions, enabling articles at different ele- application of an achromatic negative lens to convert vations to be reached, has been patented by Mr. Robert the converging rays coming through the…
Gas · Patents · Air · Munn · Scientific American · Adapted · Largest circulation · Gas motors · Rand drill · Carbonic acid · Nitrous acid · Sewing machine · Storage battery · Horse power · Gas engine
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