'Transactions of the Bombay Geographical Society, from January 1847 to May 1849. Edited by the Secretary. Volume VIII.' [‎76] (92/496)

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laid before the meeting on the instruments in the possession of the Society. An
account of stock was directed to be laid before them annually at the meeting of
May, along with their accounts.
Report by the Secretary on the Instruments belonging to the Geographical Society.
The instruments in our repositories consist of the following A Dipping Circle
with four Needles, by Robertson, London. One of the glasses of the circle is
wanting—it could easily be replaced in Bombay. The needles are all rusty. The
instrument could without difficulty be rendered serviceable—it would probably be
well to have new needles from London. In this case, to prevent their rusting, I
should recommend that they be coated with bees-wax, which might readily bo
removed on their arrival here. Slips of zinc in the box would probably prove a
preventive. A dipping needle seems at one time to have been sent by the Society
for use at Madras: the subject is referred to in a number of the Madras Transac
tions, on which at present I am unable to lay my hands. There are two Magnetic
Bars along with the needles, for the purpose of induction.
Barometers.—Four Barometers are set down in our list as once having been pos
sessed by the Society: three seem to have been given away-—one now remains. It
is a Syphon on the Guy-Lussac principle—cut by French measure. It has the
usual fault of French instruments, and is too light and frail for field service : it seems
in good order.
Thermometers.—There are two pairs of self-registering Thermometers, the maxi
mum and minimum on the same plate. The scales are cut in centisimal degrees
from 1 to 50, or from 32 to 122 of Fahrenheit. In one, the bulb of the mercurial
Thermometer is broken, the other is in good order: in the other the spirit Ther
mometer is in good order. The steel index is entangled amongst the mercury of
the maximum thermometer. This probably could be rectified, and the instrument
made servicable.
Three Thermometers on wooden scales, by Robertson.' The bulbs of two are
broken, and the instruments useless:—the third is in good order.
One Daniell’s Hygrometer in good order.
One ditto ditto broken and quite useless.
One iEthrioscope in good order—the reflector good. A Photometer— the glass
cover broken.
A wet bulb Thermometer, with long scale:—the three thermometers seem fine
and delicately cut instruments.
A colour box of 17 colours, 12 good and unused, and 5 used and small pieces.
•The following is the only list of instruments I can find
4 Mountain Barometers.
1 Barometer.
2 Register Thermometers.
1 Dipping Needle.