108 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



Three Small Hand-Microscopes. — With regard to these, which were 

 exhibited by Mr. E. Swan at the Meeting in last November,* it is 

 interesting to note that a figure and description of the original instru- 

 ment has been found by Mr. Parsons in the first edition of Carpenter 

 on the Microscope (1856), p. 73, fig. 15. It was designed by Mr. 

 Gairdner and made by Bryson of Edinburgh. 



Berger's New Microscope. — The accompanying cut (fig. 2) illustrates 

 the description of the mechanical stage of Berger's new Microscope, 



Fig. 2. 



which appears on p. 649 of the Journal for 1899 ; see also figs. 98, 99, 

 and 100 on pp. 584, 585, in the Journal for 1898. 



Leitz Travelling Microscope. — This instrument (fig. 3) packs into 

 case 21 by 14 by 7 cm., and weighs only 4 lb. It will be seen from the 

 figure that to set up the instrument for use, the mirror and stage have to 

 be attached, and the tube which carries the ocular must be unscrewed 

 and reversed. It will also be seen that it has rack-and-pinion coarse, 

 and micrometer-screw fine adjustment ; the only point not quite clear 

 in the illustration being the method of folding the foot. This foot is a 

 very ingenious one, consisting of two solid rectangular bars of brass 

 lying against each other when the instrument is packed, but which can 

 be opened out so as to make an angle of some 40°, in which position 

 they are firmly held by a spring-catch, and as there is no inclination, 

 this gives ample stability. 



Leitz Horizontal Microscope or Cathetometer. — This instrument 

 appeals rather to the physicist than the rnicroscopist ; it consists essen- 



* Cf. this Journal, 1899,'p. CA3. 



