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Bimetallic actinograph Mk III

1949

Bimetallic actinograph, M.O. Mark III, by Casella, 1955

1955
Hurter and Driffield Actinograph, small mahogany box containing exposure calculator and an original carton by Marion and Co.

Hurter and Driffield Actinograph and Original Carton

1885-1920
Hurter and Driffield actinograph (first model). Patent 5545, 1888. Wooden slide-rule calculator with revolving scale of time, month and day, N. latitude 52 degrees 32' 0". Sliding scales: f.no., time lighting H and D speed. With instruction book.

Hurter and Driffield actinograph (first model). Patent 5545

1888
Hurter and Driffield actinograph, sold by Marion and CO. , London. Wooden slide-rule calculator; sliding card scale for time of month and day, N. lat 32 degrees 30'. Calibrated for H and D speeds, 0.5-300; lighting, f no. exp time.

Hurter and Driffield actinograph