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- W4210818331 abstract "Prepare two plates or tools of brass, the one convex, and the other concave, being both portions of a sphere of the same radius as the focal length of the object glass you want to have, or rather of a radius somewhat longer than the focal length you want, for a dioptrical reason; let these plates or tools be between two and three times the breadth of the object glass desired; or, in long focal lengths, twice the breadth will be sufficient: let these tools be of a sufficient thickness in proportion to their breadth or diameter, and let them be ground with fine emery exactly true to one another, working them alternately, the one above the other, to preserve the same focal length; or, if it is desired longer, you must work the convex above the concave; or, if desired shorter, you must grind the concave above the convex." @default.
- W4210818331 created "2022-02-08" @default.
- W4210818331 date "1769-12-31" @default.
- W4210818331 modified "2023-09-25" @default.
- W4210818331 title "LXVIII. A method of working the object glasses of refracting telescopes truly spherical. By the late Mr. James Short, F. R. S" @default.
- W4210818331 doi "https://doi.org/10.1098/rstl.1769.0068" @default.
- W4210818331 hasPublicationYear "1769" @default.
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