Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 36
g more acute as theprincipal axis is approached, and the deviation being greater as theangle is more obtuse. In fig. 8 let O P be the axis in each case ; then, from what wehave seen, it is manifest that rays parallel to the axis falling on theprisms with their bases in contact and acting like a…
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