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A pulley system used to reduce motion between the piston and the indicator of the steam engine. The indicator is attached by a string on the curved bottom triangle. As the piston moves, the string is pulled to record the pressure of the steam.

Reducing Motion of Piston and Indicator using Brumbo Pulley

A pulley system used to reduce motion between the piston and the indicator of the steam engine. The…

A reducing lever for large engines to measure pressure of steam in the cylinder. The string to the indicator is pulled as the piston compresses the steam. Similarly, the string is pulled as the steam is expanded.

Reducing Lever for Piston and Indicator in Large Steam Engines

A reducing lever for large engines to measure pressure of steam in the cylinder. The string to the indicator…

"It is placed horizontally with the pivot, B, resting on a support opposite the crosshead when in mid—position. If the pivot B is adjusted to the proper height and at the right distance from the cross head, the cord from the indicator may be attached to the pin E without any pulleys."—Derr, 1911

Horizontal Pivot Pantograph for Motion Reduction between Piston and Steam Engine Indicator

"It is placed horizontally with the pivot, B, resting on a support opposite the crosshead when in mid—position.…

A pantograph used to reduce motion of the piston. At point D, a string is attached to the indicator, measuring pressure of steam in cylinder. The pantograph is attached to a solid surface on top. As the piston moves, the pantograph pulls the string.

Motion Reduction using Pantograph of Piston Connected to Indicator of Steam Engine

A pantograph used to reduce motion of the piston. At point D, a string is attached to the 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…

"If only one indicator is to be used for both ends of the cylinder, it may be connected by side pipes and a three way (pipe valve). By this method both diagrams are taken on the same card and with the loss but one revolution." —Derr, 1911

Three Way Pipe Valve for Attaching One Steam Engine Indicator

"If only one indicator is to be used for both ends of the cylinder, it may be connected by side pipes…