Abstract
THE registration of temperature is one of the most difficult of meteorological problems. Among the registering instruments employed the thermometer is certainly that to which most attention has been devoted, and yet no solution has hitherto given results altogether satisfactory. The extreme mobility of the temperature of the air and the small force at our disposal for acting upon the registering apparatus, are special hindrances to the solution of the problem. In England, in the various observatories, the photographic method is used. The reservoir of the thermometer is placed outside under cover, and the tube, entering the wall, is re-curved vertically in the interior; a photographic apparatus placed opposite this column of mercury registers the different heights. This process necessitates a thermometric reservoir of considerable volume in order that the displacements of the column of mercury may be appreciable for very small variations. These exigencies affect the sensitiveness of the apparatus; it is not a less serious inconvenience that the reservoir must be placed near the wall of the shelter where the self-recording photographic apparatus is arranged. In Switzerland the metallic thermometer is employed, and is more easily managed, but here again the metallic spiral must be placed very close to the registering apparatus.
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A New Registering Thermometer 1 . Nature 16, 421–422 (1877). https://doi.org/10.1038/016421a0
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DOI: https://doi.org/10.1038/016421a0