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VISUAL DESCRIPTION
This is an advertisement for the Smith's Portable Air Speed Calibrator. The image features a vintage style ad with text and an illustration of the calibrator device itself. At the top, there are wings as part of the logo for Smith's Aircraft Instruments, suggesting flight and aviation relevance. The caption details that this calibrator has been designed to serve as a portable sub-standard for checking the accuracy of airspeed indicators and is particularly suited for use on aerodromes (airfields). It describes that it consists of a Water Manometer which reads directly in air speeds from 10/160 mph or from 40/140 Knots, indicating its capability to measure speed within those ranges. It also mentions that while calibrated to these ranges, higher range calibration can be supplied upon request. The instrument is touted as being rugged and robust enough to withstand all ordinary conditions of landing without developing inaccuracies. The calibration process involves using distilled or filtered water only because of considerations regarding the compressibility of air. At the bottom, additional information about Smith’s Aircraft Instruments includes their address at 185 Great Portland Street, London W1. , highlighting their location in England during what appears to be an early-to-mid-20th-century period based on typography and design aesthetics. Type A. V. 569 likely refers to a model number or type designation for this particular piece of equipment offered by Smith's Aircraft Instruments.
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