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Maker
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Edison's Original Micro-Tasimeter, 1878

Edison's Original Micro-Tasimeter, 1878

1878
Langley's Bolometer, 1880-1890

Langley's Bolometer, 1880-1890

1880-1890
Langley's 'Great' Bolometer, 1880-1890

Langley's 'Great' Bolometer, 1880-1890

1880-1890
Callendar's Bolometer, 1914

Callendar's Bolometer, 1914

1914
Callendar's Absolute Recording Bolometer, 1905

Callendar's Absolute Recording Bolometer, 1905

1905
Boys' Radiomicrometer, 1887-1900

Boys' Radiomicrometer, 1887-1900

1887-1900
Original Cup Radio-Balance by H. L. Callendar, 1910

Original Cup Radio-Balance by H. L. Callendar, 1910

1910
Callendar's Original Radio Balance, 1905-1906

Callendar's Original Radio Balance, 1905-1906

1905-1906
Callendar's Disc 'Radio-Balance', 1905-1920

Callendar's Disc 'Radio-Balance', 1905-1920

1905 (invented); 1907-1920
Boy's Radio-Micrometer with two suspensions (not seen) and cover, by The Cambridge Scientific Instrument Company, Cambridge, England, 1889-1893.

Boys' Radio-Micrometer, 1889-1893

1889-1893