Elementary science applied to sanitation and plumbers' work by Herring-Shaw A

Author:Herring-Shaw, A
Language: eng
Format: epub, pdf
Publisher: London, Gurney and Jackson; New York, D. Van Nostrand Company
Published: 1910-03-25T05:00:00+00:00

I

FIG 63

BAROMETERS

139

water must be 13'6 times (as long as) the column of mercury, for the specific gravity of mercury is 13-6

.-. Length of water column = 13-6 x 30 ins. 13-6x30

12

ft. = 34 ft.

Thus a column of water 34 ft. high would balance the atmospheric pressure, and it would form a water barometer.

The Aneroid Barometer, shown in Fig. 66, is made in various sizes, ranging from 2 ins. to 10 ins. diameter.

FIG. 66

It consists of a cylindrical box of metal, with a top of thin, elastic, corrugated metal, from which the air is removed. When the atmospheric pressure increases, the top is pressed inwards, and when it is diminished, the top is pressed outwards by its own elasticity, aided by a spring beneath.

These movements are transmitted and multiplied by a combination of delicate levers which act upon an index hand, and cause it to move, either to the right or left of a graduated scale. These barometers are self-correcting for variations in temperature.

FIG. 65

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