ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



85 



MICROSCOPY. 



A. Instruments, Accessories. &c* 

 CI) Stands. 



New Binocular Microscope. t — F. E. Ives, after an enumeration of 

 the inconveniences which render the ordinary binocular unsuited for 

 high-power work, describes one of 

 his own invention, which has the 

 following advantages :— (1) It is 

 .a short-tube Microscope ; (2) The 

 parts which make it a binocular 

 may be attached to an ordinary 

 Microscope without alteration ; 

 {:->) It is not an expensive attach- 

 ment ; (4) It does not interfere 

 with the use of the Microscope as 

 a monocular with variable tube- 

 length ; (5) It may be used either 

 as a binocular non-stereoscopic 

 Microscope, or as a binocular stereo- 

 scopic Microscope ; (0) As a non- 

 stereoscopic binocular, it sends to 

 both eyes images practically iden- 

 tical with the single image of a 

 monocular, no diffraction pencils 

 being cut off from either image, 

 .and it is as satisfactory with the 

 highest as with the lowest powers, 

 •dividing the work evenly between 

 the two eyes even when doing the 

 most critical work ; (7) As a stereo- 

 scopic binocular, it yields to both 

 eyes images distinctly more perfect 

 than either image in a Wenham 

 binocular, and, while giving true 

 stereoscopic relief with medium 

 and low powers, never exaggerates 

 this effect, as the Wenham bino- 

 cular sometimes does. As against 

 these advantages may be placed 

 the fact that it requires a little 

 more skill to adjust it than the 

 Wenham binocular ; but it should 

 not be at all troublesome to the 



* This subdivision contains (1) Stands; (2) Eye-pieces and Objectives; (3) Illu- 

 minating and other Apparatus; (4) Photomicrography; (5) Microscopical Optics 

 and Manipulation; (6) Miscellaneous. 



t Journ. Franklin Inst., cliv. (1902) pp. 441-5 (1 fig.\ 



