What is recorded here?
Watt's1769 specification separates the steam cylinder, kept hot, from a distinct condenser kept cold, with provision for removing non-condensable air. An engine need not repeatedly cool the vessel where steam performs its work. Moving condensation elsewhere changes that thermal arrangement. Preserved1765 models document development, including imperfect early hardware; industrial realization is a further step.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
The exact target is the first three thermal-design principles in the 1769 specification, inspected in its 1855 official reprint and crosschecked with museum records. A patent is not measured fuel efficiency or validation of every proposed mechanism. Newcomen's earlier engine, later manufacture and Boulton's business contribution remain separate; Watt did not invent steam power as a whole. The second model is not relabeled as the first.
Read the original work
- James Watt, Steam Engines: Specification No.913 of 1769, official London reprint1855
- Powerhouse Collection, Specification of James Watt's separate condenser patent, Object92/1
- Science Museum Group, Watt's second separate condenser,1765, Object1876-1267
- Science Museum curator Ben Russell, James Watt and the separate condenser,5 January2019
This English explanation is an editorial reading view. It does not replace the complete original work or certify its science.
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People and systems
James Watt
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English catalogue narrative
Watt: separating the steam cylinder from the condenser
Watt's1769 specification separates the steam cylinder, kept hot, from a distinct condenser kept cold, with provision for removing non-condensable air.
An engine need not repeatedly cool the vessel where steam performs its work. Moving condensation elsewhere changes that thermal arrangement. Preserved1765 models document development, including imperfect early hardware; industrial realization is a further step.
Scientific scope
The exact target is the first three thermal-design principles in the 1769 specification, inspected in its 1855 official reprint and crosschecked with museum records. A patent is not measured fuel efficiency or validation of every proposed mechanism. Newcomen's earlier engine, later manufacture and Boulton's business contribution remain separate; Watt did not invent steam power as a whole. The second model is not relabeled as the first.
People and systems
James Watt
Original sources
- James Watt, Steam Engines: Specification No.913 of 1769, official London reprint1855
- Powerhouse Collection, Specification of James Watt's separate condenser patent, Object92/1
- Science Museum Group, Watt's second separate condenser,1765, Object1876-1267
- Science Museum curator Ben Russell, James Watt and the separate condenser,5 January2019