Judson and Cogswell Governor, Patent Model


This model was submitted to the U.S. Patent Office with the application for the patent issued to Junius Judson and William A. Cogswell, of Rochester, New York, November 9, 1875, no. 169815.

The model represents a flyball governor in which the driving pulley is fitted loosely to the driving shaft and connected to it by a spiral spring, which allows a free turning of the pulley on the shaft to an extent sufficient to counteract the jerks or impulses, which are transmitted to the governor by the uneven operation of the engine.

The inventor states that the ordinary crank motion of a steam engine results in an unequal operation that is not always equalized by the flywheel of the engine. This irregularity, though not always perceptible, is transmitted to the governor, which, when operated unevenly, would exaggerate the variations. This device is designed to prevent the jerks being transmitted to the governor.


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: 1875Patent Date: 1875-11-09

Inventor: Judson, JuniusCogswell, William A.

Location: Currently not on view

Place Made: United States: New York, New York CityAssociated Place: United States: New York, Rochester

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


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.309244Catalog Number: 309244Accession Number: 89797Patent Number: 169,815

Object Name: governor, steam engine, modelpatent model, governor, steamObject Type: Patent Model

Measurements: overall-from catalog card: 15 in x 18 1/4 in; 38.1 cm x 46.355 cmoverall: 18 3/4 in x 15 in x 11 1/2 in; 47.625 cm x 38.1 cm x 29.21 cm

Guid: http://n2t.net/ark:/65665/ng49ca746ac-e087-704b-e053-15f76fa0b4fa

Record Id: nmah_1376719

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