SCIENCE-GOSSIP. 





MICROSCOPY 



Micro-Photography. — We have had submitted 

 for examination by Messrs. Newton and Co., of 

 Fleet Street, London, a combination of their 

 students' microscope and photo - rnicrographic 

 apparatus, which we figure separately and in 



Newton and Co.'s New Pattern Student's Microscope. 



association, for the use of our readers. The new 

 pattern students' microscope was specially designed 

 to include the most modern improvements and 

 still be both portable and inexpensive, the price 

 being £-, 15s. 6d. This instrument is especially 

 suitable for photography, as it bends steadily into 

 a horizontal position, and may be then moved on 

 an axis right round a circle on the foot. We have 



seldom seen a more firmly made instrument at the 

 price. There is a good fine adjustment as well as 

 the ordinary rackwork movement. Messrs. 

 Newton's photographic apparatus figured below 

 is very simple, and can be used in connection with 

 any microscope. The leather collapsing arrange- 

 ment gives a range of extension for focussing the 

 plate, and there is a fine movement as well as the 

 ordinary extension screw. Its price is four guineas. 

 With this instrument any naturalist should be able 

 to prepare beautiful negatives, that would produce 

 useful lantern slides ; these are the coming features 

 of scientific meetings. 



A new Centring Underfitting. — Possessors 

 of students' microscopes whose work has, with 

 increasing knowledge, called for additional facilities 

 for accurate manipulation, have frequently wished 

 that some means of centring the substage condenser 

 could be adapted to their instrument. It is true 

 that one or two opticians now manufacture many 

 parts of their microscopes to gauged sizes, enabling 

 a worker, should he desire to do so subsequently, 

 to himself replace the plain underfitting with a 



Centring Underfitting. 



substage, but it has been felt that something less 

 costly than this might be advantageously intro- 

 duced. Our attention has been called to a new 

 centring underfitting, which has been recently 

 designed by Messrs. W. Watson and Sons, of 313, 

 High Holborn. It enables a condenser to be exactly 

 centred, in the same manner as with a substage, 

 and it is shown in the accompanying figure. It 

 was designed primarily for that firm's Edinburgh 

 Students' Microscopes, but we understand that it 

 can be readily adapted to almost any form of 

 students' microscope. 



Eye of Beetle for Multiple Image. — " The 

 Microscope," for July, 1895, says : '* Have a diffuse 

 side-light ; use plane mirror and small aperture of 

 diaphragm. Focus on the piece of cornea ; then 

 with one hand, held about three feet from the 

 mirror toward the light, with fingers spread and in 

 motion, and with the other hand on the fine 

 adjustment, slowly draw the objective back from the 

 slide, watching the facets of the cornea until 

 hundreds of tiny hands are seen. After you have 

 learned how to do it, anything may be substituted 

 for the hand. A profile-face against the sky, a house 

 in bright sunlight, etc. They will not be right side 

 up, owing to reversal in forming the images." 



Newton and Co.'s Photo-Micrographic Apparatus. 



