710 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



wooden case 21 cm. liigh (with a glass cover), the front of which 



is removed when in use, and 

 horizontal axis by the screw a. 



it can be set at any angle on its 

 The speciality of the construction is 



the large stage, 12 cm. by 9 cm., consisting of a lower plate c c 



Fig. 136. 



Fig. 137. 



carrying a wheel of diaphragms, and an upper plate e e sliding between 

 two pieces d d' (^ith spring clips) supported on four short uprights. 



The eye-piece is Huyghenian, without any diaphragm, and the 

 (concave) mirror is of metal attached to the bar b. 



The third Microscope figured is one given by Franz I., in 1815, to 

 the Vienna Technical High School, resembling most that of Tiede- 

 mann described by Harting.* It is engraved with the name of an 

 unknown maker, " Otteny," with " Mecha. Fe. in K.K. Phis. Kabin." 

 added. I 



The remaining six are not figured. One is a Cuff instrument,J 



* Harting, P., ' Das Mikroskop,' iii. p. 12G. 



t In the plate " Schia. Kab." 



X Harting, P., 'Das Mikroskop,' iii. p. 114. 



