Kinematographic Record of Sunrise on the Moon

Details Kinematographic Record of Sunrise on the Moon Kinematographic Record of Sunrise on the Moon

Jul 1929

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1929natur.124...56a&link_type=abstract

Nature, Volume 124, Issue 3115, pp. 56-57 (1929).

Physics

Scientific paper

ON the night of May 17-18, 1929, between 1.5 h. and about 5.5 h. Greenwich civil time (18 d.) a moving picture was made here of the lunar crater Copernicus, showing changes in the shadows at sunrise. A Victor kinema camera, using amateur-size film (16 mm.), was employed, attached in the focal plane of the 23-inch refractor (30 feet focal length) of the Princeton University Observatory. A yellow Wratten filter No. 45 was inserted about 15 inches ahead of the film. Exposures were made every 6 seconds, approximately, for about 4 hours, on Agfa negative film. The duration of each exposure was about 3.8 seconds, controlled by the rotating camera shutter (sector opening 200°), which was driven by a belt from a light electric motor carried in the same aluminium frame.

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