This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1911 Excerpt: ...barometer, gave the pressures of the air in the
bell-jar and on the exit side of the filter respectively. All the
tubing through which the air passed was block tin. Throughout each
experiment the pressure of the air in the bell-jar was kept
constant by regulating the stop-cock, C, so that the abstraction of
air by the pump was exactly compensated by the gain through C. Fig.
13. The galvanometer measures only that part of the electricity
entering the bell-jar by the wire, ww, which leaves it by its metal
base. This part is very nearly the whole. The observed results show
that it is enormously great in comparison with the very small part
which is carried away ki the current of air to the electric filter.
The galvanometer was shunted by a battery of Leyden jars, J, to
give steady deflections. Its sensitiveness was l/22-l of a
mikro-ampere per scale division. 83. First, we kept the potential
of the needle constant throughout a set of experiments made at
different air-pressures, and in this way we found that the current
through the air to the metal of the jar became greater as the
pressure of the air in the bell-jar became less, down to the lowest
pressure to which we went, which was 40 millims. Curve 10 shows the
relation between the current and the air-pressure at a potential of
5000 volts. Similar curves were got for other electric potentials.
84. We found also that as the air became rarer it was not so much
electrified. This was shown by the electric filter and
electrometer. Thus the electrometer deflection for a pressure of
360 millims. was only about one-sixth of that for 760 millims. with
the same number of strokes of the pump, and the same potential of
the electric machine. Curve 10. 85. We next kept the pressure of
the air in the bell-jar constant and v...
|Country of origin:
George Gabriel Stokes
• Baron William Thomson Kelvin
||246 x 189 x 6mm (L x W x T)
||Paperback - Trade
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