Abstract
MESSRS. C. F. CASELLA AND CO., LTD., have submitted a “night marching watch,” designed by Mr. E. A, Reeves, and costing 2l. 15s. This is an ingenious device intended to help travellers to know their bearings when moving at night, provided that they are able to recognise the brighter stars. The stars made use of are Aldebaran, Rigel, Sirius, Procyon, Regulus, Denebola, Spica, Arcturus. Antares, Altair, Fomalhaut, Capella, and, of course, by day the sun. The positions of these, together with the days of the months, are printed on a ring outside the watch face, but under the watch glass, and capable of being turned by the bezel (which unfortunately is smooth instead of being milled) so as to bring the date against the hour XII. Then the hour on the watch face under any star's position when multiplied by two is the time measured from noon to this star's meridian passage. A rectangular mark of luminous radium paint carried on the star rim is then set to this doubled time, and the watch is ready for use with that star.
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Reeves's Night Marching Watch . Nature 90, 711 (1913). https://doi.org/10.1038/090711a0
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DOI: https://doi.org/10.1038/090711a0