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Pocket altazimuth compass-clinometer, British, 1871-1893

1871-1893

Prismatic magnetic compass, British, 1827-1848

1827-1848

Fahrenheit thermometer

1826-1854
Electrically illuminated liquid prismatic compass by Kelvin, Bottomley and Baird, early 20th century

Surveying compass, British, 1913-1920

1913-1920
ML-IK dental X-ray tube, by Keleket, England, 1938-1955

ML-IK dental X-ray tube

1938-1955
ML-ZW X-ray tube by Machlett. England, 1938-1955

ML-ZW X-ray tube by Machlett. England, 1938-1955

1938-1955
Clinometer patent by C. A. Schmalcalder, 82 Strand, London, England, 1810-1826.

Patent clinometer, British, 1810-1826

1810-1826
Photograph of Amsler current meter by Stanley, 1915

Photograph of Amsler current meter by Stanley

1915
Brunton pocket transit compass with case by E.R. Watts, c.1930

Brunton pocket transit compass with case, 1925-1930

1925-1930
Prismatic magnetic compass, Verner type pattern, Mk VIII, adapted for night marching, unsigned, British, 1918

Prismatic magnetic compass, British, 1918

1918