Indicator, McNaughts steam engine indicator consists of a tubular body to which a rotating sleeve is attached to an arm. A string that has been rolled around the tube at the bottom can be attached with an end to a moving machine part, so that the tube rotates with every stroke and is then returned to its original position by the rolled-up spring at the bottom of the tube. A paper is attached to the tube. A piston with piston rod is arranged in the body under a spring, which is moved up and down by steam or vacuum. The body is screwed onto the cylinder with the tap on the underside, so that the

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Photo credit: © Gibon Art / Alamy / Afripics
License: Royalty Free
Model Released: No

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