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Sir, The Advantage it would be to have  Lenses  of the spherical Kind, Segments of a true Sphere, hath occasioned the Invention of many Machines and Methods of Grinding, in order, to produce such Segments: But nothing hitherto made public hath answered the End proposed.

philosophical transactions of the royal society of london

I. The figure of a machine for grinding lenses spherically, invented by Mr. Samuel Jenkins, and communicated by him to the Honble Sir Hans Sloane, Bart. Pr. R. S. &amp;c.