Print of a diagram showing the way a backstaff or Davis quadrant, a navigational instrument, is used to measure the elevation of the Sun. Measured at ...

Print of a diagram showing the way a backstaff or Davis quadrant, a navigational instrument, is used to measure the elevation of the Sun. Measured at ...
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DETAILS
Image Number: 1895-24592Rights ManagedCredit Line:SM/SSPL/Science and Society/SuperStockCollection:Science and SocietyContributor:SM/SSPLModel Release:NoProperty Release:NoResolution:2884×3508
1914-1918
astronomy|
backstaff|
Davis|
First World War|
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