Indicator, P.N. Rijk, A.M. de Jong, 1865 Canvas Print
McNaught's steam engine indicator consists of a tubular body to which a rotating tube is attached to an arm. A string, which is rolled around the bottom of the sleeve, can be attached to a moving machine part with an end, so that at each stroke the sleeve rotates and is then turned back to its original position by the rolled spring at the bottom of the sleeve. A paper is attached to the sleeve. In the body, a piston rod is placed under a spring, which is moved up and down by steam or vacuum. With the tap on the underside, the body is screwed onto the cylinder, so that the piston of the signaller moves up and down equally with the piston of the steam engine and proportionally with the steam and vacuum pressure.
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