98 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



The Binocular. — A. special form of the Imperial Microscope is made 

 with a binocular body, in which the limb of the instrument is some- 

 what lengthened to give extra length of fitting for the body, or a 

 binocular body interchangeable with the ordinary body may be sup- 

 plied 



Baker's Portable Diagnostic Microscope. — This instrument, which 

 in 1896 was described in this Journal, has now been made of "mag- 

 nalium " by Messrs. C. Baker, and was exhibited by Mr. Ciirties at the 

 October Meeting, 1901. This Microscope was originally designed by 

 Surgeon-Major Ronald Boss for the special use of officers in the Indian 

 Army Medical Department for the diagnosis of malarial fever. It is 



Fig. 19. 



fitted with a spiral pinion and rack coarse adjustment, a direct-acting 

 screw fine adjustment, a draw-tube, which when extended gives a tube 

 length of G | in. (170 mm.), a sliding tube to carry a substage condenser, 

 and plane and concave mirrors. Its weight is 14 oz. (397 grams). When 

 folded the instrument measures 7 by 3 by 2| (178 by 76 by 70 mm.), 

 but when open the spread of the tripod is 6^ by 6 (165 by i52 mm.). 

 ".Ma«nalium," an alloy of aluminium and manganese, is a tougher and 

 much more useful metal than aluminium, though it possesses a specific 

 gravity of only 2*5. 



Seibert's Travelling Microscope.* — In this Microscope the designer 

 has tried to reduce the weight to a minimum, and yet to adapt the instru- 



* Zeitschr. f. angew. Mikr., vii. (1901) pp. 141-3 (2 figs.). 



