MICROSCOPE AND ACCESSORIES 



[CH.I 



Length in Millimeters and Parts included in the " Tube-Length " by 

 Various Opticians. 



Pts. included 

 in "Tube- " Tube-Length " in 



Length." Millimeters. 



See Diagram. 



f Chas. Baker, London, England 150 or 250 mm. 



I The Bausch. & Lomb Optical Co., 



Rochester, N. Y 160 mm. 



I R. & J. Beck, London, England 160 or 220 mm. 



j B£zu, Hausser & Cie, Paris, France 180 mm. 



I Klonne und Miiller, Berlin, Germany 160 or 250 mm. 



h&\ Queen & Co., Incorporated, Phila. , Pa. 170 mm. 



Ross, Ltd, London, England 160 or 254 mm. 



W. und H. Seibert, Wetzlar, Germany_i7o mm. 



Swift & Son, London, England 160 or 228 mm. 



Voigtlander und Sohn, A. G 160 mm. 



Watson & Sons, London, England 160 or 250 mm. 



R. Winkel, Goettingen, Germany 192 mm. 



Carl Zeiss, Jena, Germany 160 or 250 mm. 



f Ernst Leitz, Wetzlar, Germany 170 mm. 



j Nachet et Fils, Paris, France 160 mm. 



a-d -| Powell & Lealand, London, England—254 mm. 



I C. Reichert, Vienna, Austria 160-180 mm. 



[Spencer Lens Company, Buffalo, N. Y. 160 mm. 



f E. Hartnack, Potsdam, Germany ___ 160 mm. 



I Dollond &'Co., London, England 165, 240mm. 



i c-f -j Verick (Stiassnie) Paris, France 160-200 mm. 



I P. Wachter, Berlin-Friedenau, Germanyi6o mm. 



[J. Zentmayer, Philadelphia, Pa 160 or 235 mm. 



Thickness of Cover-Glass for Which N on- Adjustable Objectives are Corrected 

 by Various Opticians. 



0.18 mm. 



0.17 mm. 



0.15 mm. 

 0.15-0. 18 mm. 



0.15-0.20 mm. 



0.12-0. 17 mm. 

 o. 10-0. 15 mm. 

 0.10-0.12 mm. 



f The Bausch & Lomb Optical Co , Rochester, N. Y. 



I Klonne und Miiller, Berlin, Germany. 



{ Queen & Co., Incorporated, Philadelphia, Pa. 



The Spencer Lens Co., Buffalo, N. Y. 

 [Voigtlander und Sohn, A. G. Brunswick, Germany. 

 f Ernst Leitz, Wetzlar, Germany. 

 \ P. Wachter, Berlin-Friedenau, Germany. 

 (_ R. Winkel, Goettingen, Germany, 

 f Chas. Baker, London, England. 

 \ R. &J. Beck. Ltd., London, England. 

 [ W. und H. Seibert, Wetzlar, Germany. 

 J E. Hartnack, Potsdam, Germany. 

 \ C. Reichert, Vienna, Austria. 

 ("Ross, Ltd., London, England. 

 -1 Verick (Stiassnie), Paris, France. 

 ( Carl Zeiss, Jena, Germany. 



J. Zentmayer, Philadelphia, Pa. 

 J Dollond & Co., London, England. 

 \ Nachet et Fils, Paris, France. 



Bezu Hausser & Cie, Paris, France. 

 / Powell & Lealand, London, England. 

 \ Swift & Son, London, England. 



Watson & Sons, London, England. 



