Antique Engine Indicator, Scottish, Scientific Instrument, Dobbie McInnes, 1920Our Stock # 18. 6792 This is an antique mechanical engine indicator. A Scottish, brass scientific instrument by Dobbie McInnes of Glasgow, dating to the early 20th century, circa 1920. Presenting a great deal of mechanical and historical interest Displays a desirable aged patina Self contained within a quality wooden case Industrial grade metal casing to the indicator shows minimal wear Measures the pressure upon a piston during its combustion cycle
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