Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 179
176 HALO. PARHELION. would be violet, the lower side red, &c. But theupper bow might have the violet below and red above,by two refractions ineach drop of rain, at mand n, and two refrac-tions at i and a ; be-cause the rays wouldbe refracted upwardsat i and downwards atA, bringing the most…
Physics
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![An illustration from Examen dv livre des Recreations mathematiqves, & de ses problemes en geometrie mechanique, optique & catoptrique [du J. Leurechon] Où sont aussi discutées & restabiles plusieurs experiences physiques y proposées (1639)](https://img.insideoutlibrary.com/img/200/ia-examendvlivredes00mydo-81-16.webp)
