The Life of John Dollond F R S Inventor of the Achromatic Telescope With a
The Life of John Dollond F R S Inventor of the Achromatic Telescope With a
John Kelly
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Et a cause de / v:=. I V I V I Tt 1 « / r, on aura— -=^, oulF=:ccl R, et partant F=zR». 32 Letters relating to a Theorem^ S^c. Voila done le fondement du principe, que j'ai employe dans ma piece, qui me paroit encore inebranlable: cependant j'en soumets la decision a I'illustre Societe Royale, et a votre jugement en particulier, ayant I'honneur d'etre avec la plus parfaite consideration, MONSIEUR, Votre tres humble et tr^s obeissant serviteur, L, Euler. Berlin, . Tuin 15, 1752. 33 A Description... of a Contrivance Jor measuring small Angles, hy Mr, John DoUond; commu- nicated by Mr, J. Short, F. R S. Read May 10, 1753. JLiET an object-glass of any convenient focal length (being truly ground and well centred) be divided into two equal parts or segments, by cutting it straight through the center; and let a piece of machinery be so contrived, as to hold these two segments in the same position to each other, as they stood in before they were cut asunder; and to be capable at the same time of drawing them to different distances from that position, in the manner as is represented in the figure.
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