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Updated: June 13, 2025
Hence, as the 10-inch heater presents an area of 331.65 square inches, we establish the fact that the reflected solar rays, acting on the same, are diffused in the ratio of 331.65 to 0.0658, or 331.65 / 0.0658 = 5,040 to 1; the diffusion of the rays acting on the 20-inch heater being as 673.9 to 0.0658, or 673.9 / 0.0658 = 10,241 to 1.
Amongst these was Sir David Brewster, who took a most lively and special interest in all my labours on this subject. In later years I resumed my telescope making enjoyments, as a delightful and congenial relaxation from the ordinary run of my business occupations. I constructed several reflecting telescopes, of sizes from 10-inch to 20-inch diameter specula.
At the extreme south-west point of land, between the bays of Callao and Miraflores, stood the strongest Peruvian battery, called the Dos de Mayo, which had only very recently been constructed. This contained two 20-inch M.L. Rodman guns, mounted on United States service iron carriages; and these formidable weapons commanded nearly seven-eighths of the horizon.
The installation, in 1900, of a photographic refractor 31-1/2 inches in aperture, coupled with a 20-inch guiding telescope, will enable Dr.
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