. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ASSAY. t5. Fig. 86 represents, in a side view, the apparatus just described. We here remark anair-cock r, and an opening ?n. At the extremity q of the same figure, the conical pipeT enters, with friction. It is by this pipe that the air is sucked into the pipette when itis to be tilled from its beak. The pipette is supported by two horizontal arms h k (fig- 87) moveable about a common axis a a, and capable of being drawnout or shortened by the aid of two longitu-dinal slits. They ar
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ASSAY. t5. Fig. 86 represents, in a side view, the apparatus just described. We here remark anair-cock r, and an opening ?n. At the extremity q of the same figure, the conical pipeT enters, with friction. It is by this pipe that the air is sucked into the pipette when itis to be tilled from its beak. The pipette is supported by two horizontal arms h k (fig- 87) moveable about a common axis a a, and capable of being drawnout or shortened by the aid of two longitu-dinal slits. They are fixed steadily by twoscrew nuts c e, and their distance may be variedby means of round bits of wood or cork inter-posed, or even by opposite screw nuts o 6. Theupper arm h is pierced with a hole, in whichis fixed, by the pressure of a wooden screw v,the socket of the pipelle. The correspondinghole of the lower arm is larger; and the beakof the pipette is supported in it by a cork stop-per L. The apparatus is fixed by its tail-piecep, by means of a screw, to the corner of a wall,or any other prop. The manner of filli
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
