
At the meeting of the Astronomical and Physical Society of 1896 March 3, Mr. George E. Lumsden proposed putting a number of bromide sheets under the tube. Several radiographs were thus taken at once. See TAPST [3] 1896, p.7.
Links:
[1] http://www.rasc.ca/category/archivetags/1896
[2] http://www.rasc.ca/category/image-galleries/national-archives/archives-1800s
[3] http://www.rasc.ca/earlysociety