13883700

Wall Art and Photo Gifts from Mary Evans Picture Library

13883700

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

Media ID 32335622

© Aviation Ancestry

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> Animals > Mammals > Muridae > Fortior

> Mary Evans Prints Online > New Images July 2023

VISUAL DESCRIPTION
This is a vintage advertisement for the Kelvin Dual Engine Speed Indicator, also referred to as a "Three-in-One Engine Speed Indicator. " The ad features an image of the instrument itself with two smaller dials on top and a larger dial in the center. Each dial is marked with RPM (revolutions per minute) readings and labeled accordingly: one for "No. 1 ENGINE" and another for "No. 2 ENGINE, " indicating that this device can monitor the speeds of two separate engines simultaneously. The main dial has numbers ranging from 5 to 45 in increments of five, multiplied by 100 as indicated by "x100" at the bottom, suggesting it can measure up to 4500 rpm. The smaller gauges go from zero to forty in increments of ten. The text above describes it as "What's new in Instruments No. 3, " implying there may be a series of new instruments being showcased or introduced sequentially. Below, further details are provided about its utility—particularly suitable for aircraft with restricted dashboard space—and its compatibility with standard K. B. B Generators. At the bottom, we see branding elements: “KELVIN” prominently displayed along with “AIRCRAFT INSTRUMENTS proven in reliability ahead in design. ” This is followed by manufacturer information: “KELVIN BOTTOMLEY AND BAIRD LIMITED - BASINGSTOKE. ” Overall, this caption conveys that we're looking at an old promotional piece highlighting technological innovation in aviation instrumentation designed by Kelvin Bottomley and Baird Limited.

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