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Date: |
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Description: | A.P. No. 3281
S.A.L LTD LONDON SERIAL N.O A.89190
S.R.E.
SRE / True Wind Calculator / A.P. 3281
TRUE WIND CALCULATOR
This instrument was designed to aid one of the great problems in navigation - establishing the heading along which a ship or aircraft was actually travelling. This is particularly affected by the heading and speed of the wind, but in order to be able to calculate the effect of the wind, it is necessary to know its absolute speed and heading (the true wind), rather than the relative speed and heading felt on the ship or aircraft (the apparent wind).
The True Wind Calculator was designed primarily for use in aircraft and allowed the navigator to work out the true wind based on the apparent wind and the aircraft's movement. By setting the dials and scales on the front of the instrument to the aircraft's speed and heading and according to the force and direction of the apparent wind, the scales on the back indicated the speed and heading of the true wind. The instrument's original wooden box also survives.
AUDIT - object needs to be marked with its NAV number. Two unnumbered parts.. Serial No.A.89190
caption: True Wind Calculator | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | course indicators | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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