Carpenter Compound Hydraulic Engine, Patent Model


The model was submitted to the U.S. Patent Office with the application for the patent issued to Oramill C. Carpenter, of Brooklyn, New York, December 17, 1878, no. 210915.

The engine is essentially a hydraulic transmission, which takes motion from eccentric cams on a central shaft turned by a steam or other engine and transmits the motion to shafts on either side of and parallel to the central shaft. The inventor designed the engine to be applied to a streetcar, and the model is mounted in a miniature nickel-plated car truck.

It is a 4-cylinder engine with opposed cylinders in groups of two. Single-acting plungers work in and out of the cylinders as the central shaft is turned. The head of each cylinder leads directly to another cylinder of reduced diameter in each of which a driven piston works through a longer stroke in time with the short stork of the driving piston. Valves for the relief of an excess pressure of liquid and spring-cushioned piston heads are described for smoother running.


This description comes from the 1939 Catalog of the Mechanical Collections of the Division of Engineering United States Museum Bulletin 173 by Frank A. Taylor.

Date Made: 1878Patent Date: 1878-12-17

Inventor: Carpenter, Oramill C.

Location: Currently not on view

Place Made: United States: New YorkAssociated Place: United States: New York, Brooklyn

Subject: Patent Models, Engine

See more items in: Work and Industry: Mechanical and Civil Engineering, Bulletin 173, Engineering, Building, and Architecture, Work, Industry & Manufacturing, Patent Models


Exhibition Location:

Related Publication: Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173

Data Source: National Museum of American History

Id Number: MC.309252Catalog Number: 309252Accession Number: 89797Patent Number: 210,915

Object Name: engine, hydraulic, modelpatent model, engine, hydraulicObject Type: Patent Model

Physical Description: nickel (overall material)Measurements: overall - from catalog card: 7 in x 12 in; x 17.78 cm x 30.48 cmoverall: 2 3/8 in x 7 1/8 in x 12 1/2 in; 6.0325 cm x 18.0975 cm x 31.75 cm


Record Id: nmah_846999

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.