THE MICRO-TELESCOPE 



for Nature-study work, for the observation of 

 minerals and to the chemist. 



Like its sister instrument, the micro-telescope con- 

 sists of an ordinary microscope to which is attached 

 a specially designed object glass in a tube, which 

 take the place of the condenser. The makers, indeed, 

 provide two of these object glasses — one for viewing 

 objects from one to two feet away, the other for 

 viewing objects from a distance of three feet to the 

 planets, if need be. Once when the instrument was 

 being tested some crumbs were placed on the floor 

 at a distance of four yards and strongly illuminated, 

 and the microscope with a 1-inch objective focussed 

 on the crumbs. With this objective in an ordinary 

 microscope the magnification would be about thirty 

 diameters. Presently some mice came out, and 

 made themselves at home with the crumbs. The 

 mice could be examined at this distance, without 

 their being aware of it, so well that individual hairs 

 were easily visible and about half a mouse was in 

 the field of view. In point of size each mouse 

 appeared about the same as a beaver within a foot 

 or two. 



Messrs F. Davidson & Co., 29 Great Portland 

 Street, London, are well known for the high state of 

 perfection to which they have brought the micro- 

 telescope and other instruments connected with 

 microscopy. 



The novelty of the micro-telescope will appeal 

 strongly to the Nature lover. At a distance of a few 

 feet a spider can be magnified to the size of a large 



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