Clipart tagged: ‘Thompson Steam Indicator’

"The indicator consists of a cylinder in which a piston is fitted, a spring, multiplying lever, and parallel motion for the pencil and cylinder or drum for the paper. The piston is fitted accurately to the cylinder and has a travel about one—half inch." —Derr, 1911

Thompson Indicator for Steam Engine

"The indicator consists of a cylinder in which a piston is fitted, a spring, multiplying lever, and…

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