Mathematics – Logic
Scientific paper
Oct 1919
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1919natur.104..153p&link_type=abstract
Nature, Volume 104, Issue 2608, pp. 153-154 (1919).
Mathematics
Logic
Scientific paper
IN a letter to NATURE of October 9 (p. 113) Mr. Mallock points out the uncertainties attaching to records of ``temperatures in the sun,'' due to the influence of the nature of the thermometer bulb on the readings. Similar uncertainties attach to readings of instruments exposed to a clear sky at night, and with even greater force, for there are two main radiation factors here, one of them being the cold ground-such thermometers being generally placed only four inches above the soil-and radiation to the ground is dependent to a very large extent on the nature and condition of the soil, or of the vegetation growing on it. It would appear that the so-called minimum earth radiation temperatures have very little value as meteorological data. Both these and readings of ``temperatures in the sun'' are affected by a source of error other than that noticed by Mr. Mallock, namely, the size of the thermometer bulb. With very large bulbs this may not obtain, but with bulbs of ordinary dimensions, say from 1.2 to 0.2 c.c., the difference caused by size is very noticeable, and is a curvilinear function of that size; with still smaller bulbs the function becomes rectilinear, the apparent radiation effect varying inversely with the linear dimensions of the bulb. Within the limits of bulb-size above mentioned, the differences observed may be 5 to 10 per cent, of the total radiation effect; and this, with readings ``in the sun,'' might represent differences of 3° to 6° F. These figures apply to mercury thermometers; I have no observations yet with alcohol thermometers.
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