Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 390
t from fig. .Ill, which illustratesthe error of not lairing the edge of the Home K in the principal foeut of the hulVs-tift: B. The rays converge on the condenser Sj SO thaiit will become in all probability impossible to focus it on theobject. This is a lateral lesson on the value of having the… … Fig. 810.—Absurdity of using a bulls-eye Fig. 311.—Absurdity of using a bulls-and a concave mirror. eye with the edge of the lamp Maine not in its principal focus. The above are fundamental principles of illumination, and if thestudent is to succeed as a manipulator he must demonstrate and…
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