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Glass Schumann type plate for negative, used with Quartz spectrograph (E.31)

Glass Schumann type plate for negative, used with Quartz spectrograph (E.31)

1932
Glass Schumann type plate negative, for Quartz spectrograph (E.31)

Glass Schumann type plate negative, for Quartz spectrograph (E.31)

1932
X-ray photographic negative of wood samples, 1978

X-ray photographic negative of wood samples, 1978

1978
4 negative images of Montreal on 90x120mm collodion plate; master copying plate for Dagron microphotograph camera.

Negative Plate for Copying to Produce Microphotographs, c 1870

1870-1880