748 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



with an iris diaphragm I. is supplied. The condenser may be focused 

 by means of the milled head T, which acts through a spiral slot and 

 moves it up or down. 



The partition E should be of suitable length for the Microscope with 

 which the Comparascope is to be used, so that it is advantageous in 

 ordering the instrument to state the length of the tube of the purchaser's 

 Microscope. Any Microscope object-glasses can be employed, though it 

 is generally convenient to use a pair of object-glasses of approximately 

 the same magnifying power. For those who have not duplicate object- 

 glasses, these can be supplied, the powers of which will be sufficiently 

 similar for ordinary work. Where extremely delicate observations are to 

 be made, specially paired object-glasses can be obtained. In this case 

 the two images are identical in magnifying power. The apparatus. 

 which has been patented, is made by the firm of R. and J. Beck, who 

 are the sole licensees. 



Fig. 169. 



Vollbehr's Microphotoscope.— This apparatus (fig. 169) was de- 

 scribed in the October Journal, p. G42. 



Reichert's New Microscope Stands with Handles.* — The principal 

 feature of these stands is the handle, a convenience which will be 

 much appreciated in laboratories and in class work. The illustrations 



* Reichert's Special Catalogue, 1905, 16 pp. 



