13884495

Wall Art and Photo Gifts from Mary Evans Picture Library

13884495

Mary Evans Picture Library makes available wonderful images created for people to enjoy over the centuries

Media ID 32336780

© Aviation Ancestry

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> Europe > United Kingdom > England > London > Transport > Aviation > Related Images

> Mary Evans Prints Online > New Images July 2023

VISUAL DESCRIPTION
This is an advertisement for "A New Course Calculator" by Smith's Aircraft Instruments. The image features a detailed illustration of the circular slide rule-like device, which appears to be designed for aviation navigation purposes. At the top, there are wings with the logo "SMITH'S" between them. The text below explains that this compact instrument is meant to be mounted on an aircraft dashboard and can be operated with one hand. It lists its components: 1. A fixed celluloid dial engraved with vertical and horizontal lines. 2. A circular rotating dial carrying ten degrees apart figures and figured every 10 degrees representing compass errors. 3. A radial arm numbered divisions. The course calculator is said to solve problems like finding the course to steer given track, airspeed, and wind; bridging known speed; calculating ground speed (modulated), rate, and ground speed when distance, time, or both are known; as well as determining wind velocity when course, airspeed, angle tack, and ground speed are known. At the bottom of the image is additional information about Smith's Aircraft Instruments including their address at 185 Great Portland Street in London along with price details for this particular product: Price £1 : 17 : 6. Type No: B59 appears near the illustrated device indicating a specific model number for reference.

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