. 'OO'j CORKCCTION 0 00") 5° 1^ IZ^7 Vl 1 I in' \/J rf 1 1 t 1 i Fig. I Fig. 2 typical correction graphs for two German and three British thermometers have been selected and appear as Figs. 1-5. Each comprises the correction curves for the various calibrations, with the actual scale correction plotted against the scale range. Effect of the Volume of Mercury (F,,)* Of the thirteen German-made thermometers listed in Table i three (nos. 863, loii and 1257) have been extensively used, especially no. 1257 with which 459 observations were made between 1928 and 1939. Four others were used
. 'OO'j CORKCCTION 0 00") 5° 1^ IZ^7 Vl 1 I in' \/J rf 1 1 t 1 i Fig. I Fig. 2 typical correction graphs for two German and three British thermometers have been selected and appear as Figs. 1-5. Each comprises the correction curves for the various calibrations, with the actual scale correction plotted against the scale range. Effect of the Volume of Mercury (F,,)* Of the thirteen German-made thermometers listed in Table i three (nos. 863, loii and 1257) have been extensively used, especially no. 1257 with which 459 observations were made between 1928 and 1939. Four others were used to a lesser degree, whereas the remaining six appear to have had little or no use. Unfortunately the early history of these thermometers is obscure as notes on their per- formance were not regularly kept. We cannot say, therefore, whether they are reliable, or whether they had been used and found erratic. On the other hand the stock of reversing thermometers carried in the ships has always been well in excess of immediate demands. Once in use a good working set of thermometers remained so until individual instruments were lost, or broken, or became erratic in their action. In these circumstances * F„ is the volume of mercury, in degrees, reversed at 0° C. It is determined for each thermometer by the maker. It is not, so far as we are aware, re-determined at any subsequent re-cahbration, 2 D X.\I,\
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
