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File:Plotting room - Whistler-Hearn plotting board.jpg

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Summary

Description
English: This photo of a U.S. Coast Artillery plotting room probably dates from the 1920s. The semi-circular "table" is a Whistler-Hearn plotting board. The two soldiers closest to the camera (wearing telephone headsets) are the plotting board arm setters, setting the primary and auxiliary arms of the plotting board to azimuths called in by observers at the battery's two base end stations.

The soldier seated at center-rear of the photo is likely operating a range correction board, used to quantify various factors that would affect the range achieved by a shell fired from one of the guns. The soldier seated at the right of the photo (wearing a headset) is likely operating a deflection board, used to quantify factors that would affect the direction (or azimuth) of a shell being fired. Both of these pieces of equipment were used to obtain corrected firing data.

The three windowed pieces of equipment on the rear wall are likely recorders for meteorological data (temperature, wind speed, wind direction, barometric pressure) used to make some of these corrections.

This plotting room appears to have been partially above ground, although many were completely buried for protection from counter fire. The light-colored tube in the rear-center appears to be a speaking tube, which may run up to a Battery Commander's position above the plotting room, or to an observation or gun position.
Date circa 1920s
date QS:P,+1920-00-00T00:00:00Z/8
Source Photo is courtesy of the Coast Defense Study Group, McLean, VA.
Author US Army official photograph

Licensing

Public domain
This file is a work of a U.S. Army soldier or employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.

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Original upload log

Transferred from en.wikipedia to Commons using For the Common Good.

The original description page was here. All following user names refer to en.wikipedia.
Date/Time Dimensions User Comment
18:22, 15 May 2010 1,950 × 1,360 (1,152,740 bytes) w:en:Pgrig (talk | contribs) This photo of a U.S. Coast Artillery plotting room probably dates from the 1920s. The semi-circular "table" is a Whistler-Hearn plotting board. The two soldiers closest to the camera (wearing telephone headsets) are the plotting board arm setters, setting

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current23:12, 9 June 2019Thumbnail for version as of 23:12, 9 June 20191,950 × 1,360 (1.1 MB)RobDuchTransferred from en.wikipedia: see original upload log above

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