. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. nd requires no complex apparatus : but we shall indicate anothermanipulation still easier, and also more exact. In this new process the pipette is filled from the top like a bottle, instead of beingfilled by suction, and it is moreover fixed. Fig. 85 represents the apparatus, d andd are two sockets separated by a stop-cock r. The upper one, tapped interiorly,receives, by means of a cork stopper l, the tube t, which admits the solution of seasalt. The lower socket is cemented on to t
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. nd requires no complex apparatus : but we shall indicate anothermanipulation still easier, and also more exact. In this new process the pipette is filled from the top like a bottle, instead of beingfilled by suction, and it is moreover fixed. Fig. 85 represents the apparatus, d andd are two sockets separated by a stop-cock r. The upper one, tapped interiorly,receives, by means of a cork stopper l, the tube t, which admits the solution of seasalt. The lower socket is cemented on to the pipette ; it bears a small air-cock n, anda screw plug v, which cegulates a minute opening intended to let the air enter veryslowly into the pipette. Below the stop-cock r, a silver tube n, of narrow diameter,soldered to the socket, leads the solution into the pipette, by allowing the air, v\hich itdisplaces, to escape by the stop-cock r. The screw plug; with the milled head v,replaces the ordinary screw by which the key of the stop-cock may be made to presswith more or less force, upon its conical ASSAY. t5
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
