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■88 MCI NTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL,, U. S. A. lens of the objective parallel with the surface of the screen If this is not done it will be impossible to illuminate all portions of the lantern b^hin/ih^ 6 Same ‘T 6 ', If U becomes necessary to place the it transparent! 1 ^ SCr6en ’ ^ be thorou S hl y wet to make readtto livhMm™^^ 0111 ' 1 ^ be c ° nnected with the lantern until ready to light up. It may, however, be filled by daylight ("the metal connect 6Wed ° n V “ d placed beside the intern ready to The Lenses must be clean. If a damp fog appears when the lantern is first lighted, it must be allowed gradually to disappear before anything can be done. If it does not disappear fn two o^ hree seconds the glass is not clean, although it may appear to be so thevwilHpa Avold touchi ”g the polished surfaced the fingers” Part n W m ™ • The y must be cleaned as described in cotton wool. miCr ° SCOpe ob J ectlve s, with a little alcohol applied with nnssfofp EN ^ E H, D T TP, Commen ce, darken the room as completely as ■Pf f f ’ see that all keys are closed ; connect the Saturator, draw the weights"^on *thp C ° ndenSer i lns f 1 the bme in its holder; place the wmghts on the pressure boards, and start the light as previously ^K Sn the . hme be g ins t0 g ive forth a brilliant glow, move e jet nearer the condenser, and focus the light on the screen. RRangement of Slides.— The slides should be carefully ar- same^ir® ^ a11 ' vdl be same way up, with the fronts .all in the r e d tr i0n p 7 hCy mUSt u S ° be in the exact order described in Jesuits Carelessness in this particular often leads to ridiculous si f m S ,'l G W L L^ The i ecturer and operator usually settle upon some * t t g,n ^ e ;T The readln « lam P we furnish is pro- uncoveJpJh bel1 .’ also . a colored light, which is covered and uncovered by a slide ; either signal can be selected.