110 



The Capillary Rotator, No. 198, Fig. 63, serves to rotate about a hori- 

 zontal axis small objects which may be contained in a capillary tube. The in- 

 strument is so arranged that the capillary tubes may be rotated within a chamber 

 fitted with cedar-wood oil, so as to obviate the disturbing effects of irregular 

 refraction and of reflection caused by the walls of the tubes. 



No. 198: Capillary Rotator, incl. case, Price: Marks 50. . Code-word: Perderas. 



Fig. 63. Capillary Rotator, So. 198. ( s / 5 Full Size.) 



While the prism-rotator is primarily designed for use on Binocular Stand X a , 

 but may also be used with other stands having a stage opening 33 mm (1V 3 in.) 

 in diameter, the capillary rotator, because it may be held by means of clips like 

 any ordinary object-carrier, is adapted for all stands alike. 



Regarding the details of the construction of the two instruments see "Zeit- 

 schrift f. wiss. Mikrosk." , vol. XIV, 1897, pp. 304 312, and also the directions 

 for using the instruments. 



Artificial Illuminating Appliances for the Microscope. 



Lamplight, if properly regulated, may almost completely replace good 

 daylight. 



It is advisable to interpose between the source of light and the mirror of 

 the microscope a spherical glass flask filled with water (such as is sometimes 

 used by Engravers) or, better still, a simple collective lens, so as to project a 

 sufficiently large image of the source of light upon the iris-opening or upon 

 the mirror. 



This flask, of about 15 cm (6 in.) diameter, is most efficient when it is 

 placed so as to be an at equal distance (about 6 inches) between the lamp and 

 the mirror of the microscope. 



We construct special stands, which are supplied either separately with the 

 flasks or together with an incandescent gas lamp on brass stand with ordi- 

 nary burner and Jena glass chimney and 2 spare mantles. 



Price : Code- words : 



No. 199: Lamp and spherical flask on statid .... Marks 22. . Perdidoso. 

 200: Spherical Flask on stand separately .... 7. . Perdigon. 



