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Hourly Readings of Black Bulb in vacuo at Ben Nevis Observatory*

Published online by Cambridge University Press:  06 July 2012

Extract

For a few years readings of a Black Bulb in vacuo thermometer formed part of the regular hourly routine work at the Observatory on Ben Nevis during the summer months, and a summary of two years' observations, for 1890 and 1891, is given in this paper. The instrument consists of the usual vacuum chamber, a spherical glass globe about 2½ inches diameter, with inside, centrically, a thermometer whose bulb and an inch or so of stem are coated a dull black. The thermometer is an ordinary, not a maximum Fahrenheit thermometer, and therefore gives the Black Bulb temperature at the instant of reading only. It was exposed on a wooden stand in a horizontal position, with the bulb projecting beyond the frame, and pointing south, about 4 feet above the broken stones which form the hill top, and was read immediately after the shade temperature during daylight hours.

Type
Appendix
Copyright
Copyright © Royal Society of Edinburgh 1902

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References

* See Journal of Scottish Meteorological Society, vol. ix. p. 256