A theodolite instrument being used for testing wind velocity at different altitudes. The purpose is to accurately calculate the drift of shells fired from rifles. The picture shows a private holding a small rubber balloon that is released and tracked using the theodolite. The officer operating the instrument is 2nd Lt. Ivan R. Tannehill, S.C., and Private J.W. Strange holds the telephone receiver and transmitter to relay readings to the meteorological plotting room. Issued notes: 60740C.

• Contributor: piemags/NSC / Alamy Stock Photo
• Image ID: 2RCA3G4
• File size: 140.9 MB (3.5 MB Compressed download)
• Releases: Model - no | Property - no
• Dimensions: 8493 x 5800 px | 71.9 x 49.1 cm | 28.3 x 19.3 inches | 300dpi
• Date taken: 24 June 2017

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