13884500

Wall Art and Photo Gifts from Mary Evans Picture Library

13884500

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

Media ID 32336792

© 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 the Smiths Revolution Indicator, Type AW. 504, a vintage aircraft instrument designed to measure engine revolutions per minute (RPM). The ad features an illustration of the round gauge with its dial clearly marked from 10 to 26 RPM in increments of two, and a smaller side view image showing the backside of the gauge where wires would be connected. The text highlights that this redesigned instrument is part of a range recently introduced by Smiths, all featuring slotted cases for electrical illumination from behind the panel. It operates on centrifugal principle and comes with improvements over previous models. Each unit is noted as being carefully and individually calibrated. Specific details provided include: - Standard Calibration: 600/2, 600 r. p. m. - Available calibrations can be customized to suit all requirements. - The overall diameter of the indicator measures 3½ inches. - The dashboard fixing hole size requirement is stated as 82 mm. - Depth: 4". - Weight: 23 oz. The bottom portion of the image contains branding information for "Smith's Aircraft Instruments" along with their address at "185 Great Portland Street, London W. 1. " which indicates their location and specialization in aviation instruments as well as marine specialists.

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