The invention of the barometer and Torricelli's explanation of the vacuity above the mercury column placed before the members of the Florentine academy a ready method of obtaining vacua; for to exhaust a vessel it was only necessary to join, by means of a tube provided with stopcocks, the vessel to a barometer tube, fill the compound vessel with mercury and then to invert it in a basin containing this liquid, whereupon the mercury column fell, leaving a Torricellian vacuum in the vessel, which could be removed after shutting off the stop-cocks. [Please select]
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It has not been thought worth while to describe the process of making stopcocks, thermometers, vacuum tubes, etc. [Please select]
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CHAPTER V MODIFIED METHODS AND SPECIAL OPERATIONS 43 Capillary tubing--Glass rod--Mending stopcocks--Closed circuits of tubing--Spirals--Ground joints--Sealing in platinum wire--Sealing vacuum tubes--Closed tubes for heating under pressure. [Please select]
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In most ordinary stopcocks the plug is solid, but the little handle is hollow. [Please select]
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=--This is sometimes necessary to make stopcocks tight, when the grinding has not been properly done in the factory. [Please select]
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The proper taper for both these cones is the same as that used in stopcocks of similar size. [Please select]
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This prevents excessive grinding of one-half of the joint in order to remove a defect in the other half, and is the method commercially used in making stopcocks. [Please select]
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