i8 



MICROSCOPE AND ACCESSORIES 



\CH.l 



e 



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. 



' The Bausch & Lomb Optical Co., 



Rochester, N. Y 160 mm. 



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



Bezu, Hausser & Cie, Paris, France 180 mm. 



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



b-d<i| Queen & Co., Incorporated, Phila., Pa. 170 mm. 



| Ross, Ltd, London, England i6oor 254mm. 



I W. und H. Seibert, Wetzlar, Germany, 170 mm. 



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



| Voigtlander und Sohn, A. G 160 mm. 



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



j R. Winkel, Goettingen, Germany 192 mm. 



[Carl Zeiss, Jena, Germany 160 or 250 mm. 



f Ernst Leitz, Wetzlar, Germany 170 mm. 



| Nachet et Fils, Paris, France 160 mm. 



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



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



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



f E. Hartnack, Potsdam, Germany 160 mm. 



] Dollond & Co., London, England 165, 240 nun. 



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



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

 j G , Q [J. Zentmayer, Philadelphia, Pa 160 or 235 mm. 



Thickness of Cover-Glass for Which Non-Adjiistable Objectives are Corrected 



by Various Opticians. 



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

 | Klonne und Miiller, Berlin, Germany. 



0.18 mm. \ Queen & Co., Incorporated, Philadelphia, Pa. 



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

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



{Ernst Leitz, Wetzlar, Germany. . 



P. Wachter, Berlin-Friedenau, Germany. 

 R. Winkel, Goettingen, Germany. 

 (Chas. Baker, London, England. 

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

 W. und H. Seibert, Wetzlar, Germany. 

 f E. Hartnack, Potsdam, Germany. 

 0.15-0. IS im. \ c. Reichert, Vienna, Austria. 

 ( Ros, Ltd., London, England. 

 0.15-0. 20 mm. \ Verick (Stiassnie), Paris, France. 



( Carl Zeiss, Jena, Germany. 

 0.12-0.17 mm. J. Zentmayer, Philadelphia, Pa. 



f Dollond & Co., London, England, 

 o. i o-o. 15 mm. J Nac het et Fils, Paris, France. 

 0.10-0.12 mm. Bezu Hausser & Cie, Paris, France. 



/ Powell & Lealand, London, England. 

 ' 10 \ Swift & Son, London, England. 



0.20 mm. Watson & Sons, London, England. 



