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Pritchard's wedge photometer
- "Pritchard's wedge photometer"
- "Pritchard's wedge photometer"@en
- "Pritchard's Wedge Photometer. By S.P. Langley, C.A. Young, and E.C. Pickering. (Investigations on Light and Heat published with appropriation from the Rumford Fund.) [From the Memoirs of the American Academy of Arts and Sciences.]"@en
- "Pritchard's Wedge Photometer : By S.P. Langley, C.A. Young, and E.C. Pickering. (Investigations on Light and Heat published with Appropriation from the Rumford Fund.)"
- "Pritchard's Wedge Photometer"