Excerpt from A Description of the Differential Expansive Pumping Engine: Giving Practical Examples of Engines at Work, and a List of Some of the Engines Already Made, With Useful Notes and Formula for Pumps and Pumping Engines

The success which has attended the introduction of the Differential Engine, and the request I Often receive for informa tion respecting it, has induced me to publish a description of the engine with illustrations of the different types which are in use; and in doing so I have appended a few notes and memoranda which may be of some use to practical men engaged in pumping Operations.

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