Steam Engine Indicator by Elliott Bros
James Watt Sale History
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Description
A Steam Engine Indicator by Elliott Bros, London, 19th Century,
In a fitted wooden case, with six external springs.
In 1794 James Watt invented the indicator to monitor cylinder pressure. His draftsman John Southern adapted it to produce pressure versus time diagrams for calculating engine power and diagnosing valve problems.
Case dimensions: H: 6 x W: 9 x D: 9 1/2 in.
From the Estate of John A. Davidson, Jr. Proceeds to benefit the APL of Lorain County and the Dittrick Museum.
In a fitted wooden case, with six external springs.
In 1794 James Watt invented the indicator to monitor cylinder pressure. His draftsman John Southern adapted it to produce pressure versus time diagrams for calculating engine power and diagnosing valve problems.
Case dimensions: H: 6 x W: 9 x D: 9 1/2 in.
From the Estate of John A. Davidson, Jr. Proceeds to benefit the APL of Lorain County and the Dittrick Museum.
Condition
Wear is consistent with age and use. All lots have imperfections or the effects of aging. Gray's Auctioneers shall have no responsibility for any errors or omissions.
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Steam Engine Indicator by Elliott Bros
Estimate $80 - $120
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