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Photograph of an objective prism of Merz

Photograph of an objective prism of Merz

1876
Prism for prismatic camera

Prism for prismatic camera

1860-1885
Prism for prismatic camera

Prism for prismatic camera

1860-1885
Objective glass prism for telescope

Objective glass prism for telescope

1890
One ten inch flint glass prism of angle 12 1/2 degrees [mounted with Inv No. 1889-68] with brass mountings and adjustments to minimum angle divation in case. Used with a 10-inch refracting telescope with equatorial mount by Cooke at the South Kensington Solar Physics Observatory and is now at the Norman Lockyer Observatory at Sidmouth, Devon

One ten inch flint glass prism

1887-1888
Flash spectra, photographed with an objective plane grating by S. A. Mitchell, Columbia University Observatory, New York City, Sumatra, eclipse expedition, 1901, May 18

Flash spectra

1901
One ten inch flint glass prism of angle 12 1/2 degrees [mounted with Inv No. 1889-68] with brass mountings and adjustments to minimum angle divation in case. Used with a 10-inch refracting telescope with equatorial mount by Cooke at the South Kensington Solar Physics Observatory and is now at the Norman Lockyer Observatory at Sidmouth, Devon

One ten inch flint glass prism of angle 12 1/2 degrees

1887-1888
Two small angle prisms each 4 in square for prismatic camera, each in metal mount with adjusting screw, wooden case for each.

Two small angle prisms each 4 in square for prismatic camera

1860-1885
6 1/2-inch Glass object glass prism with case for telescope, made by Adam Hilger c. 1890, and used at the South Kensington Solar Physics Observatory

6 1/2-inch Glass object glass prism with case for telescope

1890
One ten inch flint glass prism of angle 12 1/2 degrees [mounted with Inv No. 1888-158 and shares the same case] with brass mountings and adjustments to minimum angle divation. Used with a 10-inch refracting telescope with equatorial mount by Cooke at the South Kensington Solar Physics Observatory and is now at the Norman Lockyer Observatory at Sidmouth, Devon.

One ten inch flint glass prism of angle 12 1/2 degrees

1888-1889