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Wall Art and Photo Gifts from Mary Evans Picture Library
13884444
Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries
Media ID 32336678
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VISUAL DESCRIPTION
This is an advertisement for the "Addison-Luard Course and Wind Calculator, " a navigational instrument designed by Smith's Aircraft Instruments. The ad highlights that this tool is specifically intended for use in aircraft operating at sea from a datum ship. It lists several functions of the model, such as solving aerial navigation problems involving four vectors: finding courses to steer in order to keep on a given bearing from a moving surface vessel; determining courses to steer to regain a moving surface vessel; calculating the radius of action of an aircraft flying outward on a given bearing from a fixed vessel, and back again; and figuring out course, speed direction, and relative ground speed to make good any given wind while on the move. The note at the bottom indicates that when fitted with an "Auxiliary Air Course Arm" (as illustrated), the instrument can be used to obtain wind speed and direction by observing drift on two courses. Below this description is information about Smith's Aircraft Instruments as well as their location at 185 Great Portland Street, London W. 1. , indicating that this advertisement likely dates back to an era when printed materials were key methods of marketing specialized equipment like aviation tools.
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