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As soon as you have an opportunity, compare them with a standard barometer, compare also your ordinary thermometer and azimuth-compass with standard instruments, and finally, have them carefully re-verified at the Kew observatory on your return to England.
I had no azimuth-compass and consequently could not observe very accurately the variation; but I believe there is so little in Mangaryn
The declination of the needle was observed by the azimuth-compass to be 22° 30 '32 "N.E., and its inclination from the elevation of the pole, 11° 11'.