The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 244
Fig. 7. Fig. S. Fig. U. Fig. 10. … Fig. 12 Fig. 13. Pig. 14. Fig. 11. Fig. 13 was a semicircle. Mr. B. undertook to test these.Thev turned the boat in circles varying (from light winds andtides) from 30 to 150 feet. Four were thought sometimes equal,and sometimes superior, to eight of fig. 3. It is demonstrablethat these blades are…
Architecture · Civil engineering · Science
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