LondonC. Reichert, Vienna .Spencer Lens Co., Buffalo .[ W. Wales, New York Bausch & Lonib Opt. Co., Rochester. B£zu, Hausser et Cie, Paris . . Klonne und Miiller, Berlin . . ] W. & H. Seibert, Wetzlar. ..... | Swift & Son, London ... . . I C. Zeiss, Jena ... . Gundlach Optical Co.,… … Tube-length inMillimeters. 203 mm. 170 mm. 146 or 200 mm. 254 mm. 160 to 180 mm. 235 or 160 mm. 254 111 in. . 216 or 160 mm. 220 mm. i6o-i8oor234mm. 190 mm.. 165 to 22S2 mm.. 160 or 250 mm. 254 mm. 220 mm.. 254 mm. 254 mm.. 254 mm., 160-1S0 mm.. 160-200 mm.. 160-250 mm. flftmm.iWum. r^mm.…
Microscopy
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