Rutherfurd Diffraction Grating

This is one of the earliest gratings made by Lewis M. Rutherfurd, and one of three that the pioneer astrophysicist, Henry Draper, acquired in the fall of 1872. The glass plate measures 2 inches square; the grating surface is 31/32 inches wide; the grooves are 13/16 inches long. The plate is marked "6480 per inch 90 L. M. Rutherfurd."
Ref: Henry Draper, "On Diffraction Spectrum Photography," American Journal of Science 6 (1873): 401-409.
D. J. Warner, "Lewis M. Rutherfurd: Pioneer Astronomical Photographer and Spectroscopist," Technology and Culture 12 (1971): 190-216.
Currently not on view
date made
Rutherfurd, Lewis Morris
overall: 2 cm x 48.5 cm x 41 cm; 25/32 in x 19 3/32 in x 16 5/32 in
overall; museum storage case: 2 1/4 in x 1 7/8 in x 2 1/4 in; 5.715 cm x 4.7625 cm x 5.715 cm
ID Number
accession number
catalog number
Credit Line
John William Christopher Draper and James Christopher Draper
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Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History


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