CATALOGUE 



ACHROMATIC MICROSCOPES, &c, 



MANUFACTURED BY 



SMITH AND BECK, 



TO WHOM THE COUNCIL MEDAL OF THE GREAT EXHIBITION OF 1851 WAS 

 AWARDED " FOR THE EXCELLENCE OF THEIR MICROSCOPES," 



6, COLEMAN STREET, LONDON, 

 March 1853. 



Their improved form of Stand, which is contrived for an easy and 

 most accurate mode of applying every kind of illumiiaation, was shown 

 by them at the Great Exhibition of 1851, and is thus mentioned by 

 the Jury : — 



" The Stand is excellent in principle ; the body, stage, and appliances 

 beneath, are all carried on one stout bar, on the recommendation of Mr. G. 

 Jackson, by means of which the centring of the Achromatic illumination is 

 rendered easy and certain ; and on any tremor being communicated to the 

 Instrument, it is equally distributed over the whole of the working parts." 

 — (Reports of the Juries, pa. 266, Class X. No. 253.) 



The increase of the Angle of Aperture, which S. & B. have lately 

 effected in their Object-Glasses, is more especially worthy of notice in 

 the lower powers, which, adjusting through considerable thickness of 

 glass, or some depth into water, will, with a large aperture, exhibit 

 those objects which are the most frequent observation of the naturalist, 

 with a definition that a smaller angle of aperture cannot give. One of 

 these Object-Glasses, a Toths (erroneously called "half-inch"), is thus 

 alluded to in the "Reports of the Juries of the Great Exhibition" 

 (pa. 266, Class X. No. 253) :— 



" The half-inch focus of 70° aperture is a wonderfully line combination, 

 easily showing objects considered difficult for a one-eighth inch focal length 

 a little more than a year since, and bearing the application of the higher 

 eye-pieces in an unprecedented manner." 



LONDON : PRINTED BY TAYLOR AND FRANCIS, 



RED LION COURT, FLEET STREET. 



