Leveling: Barometric, Trigonometric and Spirit

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D. Van Nostrand, 1887 - 145 Seiten
 

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Seite 11 - B by means of four large screws P and the ring R ; on the ring R screws the cap S, which covers the lower parts of the cistern, and supports at the end of the adjusting screw O.
Seite 11 - ... up of a glass cylinder F, which allows the surface of the mercury q to be seen, and a top plate G, through the neck of which the barometer tube / passes, and to which it is fastened by a piece of kid leather, making a strong but flexible joint.
Seite 19 - The instrument can then be hung up and readjusted. The tube and its contents having been undisturbed, the instrument should read the same as before. If a little mercury has been lost during the operation, and there is none at hand to replace it, no serious harm has been done; but if much is lost, the open end of the tube may become exposed in inverting the instrument, in which case air may enter.

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