Mathematical elements of natural philosophy, confirm'd by experiments : or, An introduction to Sir Isaac Newton's philosophy (1747)
Gravesande, Willem Jacob 's, 1688-1742, Desaguliers, J. T. (John Theophilus), 1683-1744, tr, Adams, John, 1735-1826, former owner. BRL, John Adams Library (Boston Public Library) BRL · London : Printed for W. Innys, T. Longman and T. Shewell, C. Hitch ..., and M. Senex ... · leaf 236
and the fifth are generallyreckond as concave Lenfes. But a concave convex Lenfe, isreckond amongfl concave or convex Lenfes, according as the oneor the other Surface predominates, in which lafl Cafe the Lens iscalld a Menifcus. But that Surface is faid to predominate whichis mofl curve, that is,… … •yrsc^scrjrr Chap. 9. of Natural Philofophy. 165 When both thefe Surfaces are fpherical, the Axis pafTes through 3003.both their Centers; but if one of them be a Plane, it falls perpen-dicular upon that, and goes through the Center of the other. Regular Lenfes are orbicular, and the Axis paffes…
Physics · Natural Sciences
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