Illustrated Catalogue Of Magic Lanterns (after November 1889, probably 1890)

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McIntosh battery and optical co., Chicago, ill., u. s. a, GUNDLACH’S OBJECTIVES FOR RESOLUTION. 53 Three System. No. 1—Dry Working. 1 inch, angle 85° $80.00 I inch, angle 80° $16.00 i “ “ 110° 50.00 | fi “ “ 135° 22.00 *A “ “ 80° 20.00 “ “ 150° 30.00 w i “ 75° 14.00 | fxV “ “ 135° 40.00 * Very long working distance; tlie 1 works through three ordinary Moller slides, t Adjustable for thickness of coyer. No. 2 Water Immersion. No. 3.—Glycerine Immersion. £ in., angle 105° W.D., T j in. $22.00 T \ “ “ 105° “ “ 26.00 - - - yL “ 35.00 “ 105° * Non-adjustable. *i in., angle 105°. xV “ “ 110° . xV “ “ 110°.. All the rest in this series are adjustable. $30.00 25.00 40.00 Four System.—Homogeneous Immersion. \ in., angle 136° W.D., ^ in. $90.00 I T V in., angle 136°, yuu in .... $120.00 i “ “ 136° “ “ 80.00 xV “ “ 136°, x^y “ .... 160.08 T V “ “ 136° “ 7 V “ 90.00 | xV “ “ 130°, ih “ ■■■■ 220.0« Numerical aperture of each 1.40. They are furnished with an adjust- able mount, moving the back system only, and being free from lost motion. We give a hemispherical lens with them for oblique illumination. Bausch & Lomb—First Quality Objectives. 3 inch angle 16° $18.00 2 “ “ 22° 18.00 1 “ “ 45° 25.00 A “ “ 98° 30.00 * “ “ 110° 34.00 * J in., angle 180° immersion $70.00 *1 “ “ 180° “ 75.00 *xV“ “ 180° “ 80.00 *r\“ “ 180° “ 90.00 * Can be used either with glycerine or water; also dry. All the above objectives of higher power than half-inch, are adjust- able for thickness of cover. Bausch. & Lomb.—Professional Objectives. All the above Objectives of higher power than half-inch, are adjust- able for thickness of cover. Bausch & Lomb.—Students’ Objectives.