“When once the idea of the separate condensation was started, all these improvements followed as corollaries in quick succession, so that in the course of one or two days the invention was thus far complete in my mind, and I immediately set about an experiment to verify it practically.”
"Notes on Professor Robison's Dissertation on Steam-engines" (1769)
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James Watt 7
British engineer 1736–1819Related quotes

My Inventions (1919)
Source: My Inventions: The Autobiography of Nikola Tesla
Context: The moment one constructs a device to carry into practice a crude idea, he finds himself unavoidably engrossed with the details of the apparatus. As he goes on improving and reconstructing, his force of concentration diminishes and he loses sight of the great underlying principle.… I do not rush into actual work. When I get an idea, I start at once building it up in my imagination. I change the construction, make improvements and operate the device in my mind. It is absolutely immaterial to me whether I run my turbine in thought or test it in my shop. I even note if it is out of balance.

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 145.

Science and the Common Understanding (1954); based on 1953 Reith lectures.

Part II, p. 64.
The Autobiography (1818)

As quoted in A 2017 Nobel laureate says he left science because he ran out of money and was fed up with academia https://qz.com/1095294/2017-nobel-laureate-jeffrey-hall-left-science-because-he-ran-out-of-funding/ (October 5, 2017) Akshat Rathi, Quartz.