Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

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INDEX 717 Lantern, square 29 "spotting" or marking 19, 201, 216 standard 202 standard American 25, 200 storing 218 summary 220 troubles in making 219 typewritten 215 unvarnished, ink and pen for 207 varnishing 205 Lantern slide carrier for delinea scope 28, 63, 196 carrier for experiments in vision 651-654 permanent 31-32 push-through form 23 ways of making 203 writing them with a pen . . 204-208 Lathe bed type of projection apparatus 262, 289 Latitude and heliostat 160 Lavasseur, Professor E 673, 685 Law of magnification and reduction 357,369 Law of reflection 140, 572-574 Law of refraction 576 Lecturer, suggestions to on magic lantern exhibition 19 Lecture rooms 439-454 Lecture room with gallery 448 with raised seats 449-451 screen at side 450-45 1 transluctent screen 453 Lehmann, fluid crystals, etc. ... 621 Leiss, C 138 Leitz, Ernst, 79, 178, 225, 299, 360, 362, 363, 364, Lens, aberration, chromatic. . . . 583 spherical ; . . . 580-586 how corrected 581 achromatic 583 aplanatic 581 axis of, principal and secondary 576-579 center of curvature 577 center, optic 576-577 concave, convex and meniscus 577 concave to make light cone parallel 273,276 convex to make light cone parallel 274-276 Lens, crystalline of the eye 657 change of shape in accommodation 658 definition of 576 dioptry of 229-230 equivalent focus of 580 focus of, principal and conjugate 578-582 focus, equivalent 580 holder for trial lenses. .651-654 meniscus 577 optic center of 576-577 principal focus of 578 principal focus, how found 579-58o principal and secondary axes 576-579 radius of curvature of 577 secondary and principal axes of 576-58o support for trial lenses. . .651-654 unit of strength (diopter) .... 229 Lenses, cylindrical for eye defects 664 detecting strain in by polarzed light 626 for experiments in vision. 65 1-672 forms of 577 position in the triple and in the double lens condenser 10, 13, 591-592 Oculists' trial 651 Leonardo da Vinci 674 Lettering, drawings 374 fastening the letters 375 size for drawings 376 Letters, a-k on specimen. . . .361, 387 on tissue paper 375 white on black ground 375 Levi Ben Gersen 674 Light from alternating current arc 565 absorption by lenses and object v 601-602, 620 amount from sun 138 amount with petroleum lamp 125 for demonstrations in vision 652, 670 from arc, cause of 546 from arc direct and alternating current 554 of arc dependent on temperature 547 avoiding stray 380 in center of condenser face ... 44