I i -
C A T A L O G U E
ACHROMATIC MICROSCOPES, kc.
MANUFACTURED BY
SMI T H AND BECK,
TO WHOM T H E COUNCIL MEDAL OF TH E GREAT EX H IB IT IO N OF 1851 WA:
a w a r d e d “ FO R T H E EXCE L L EN C E OF T H E IR MICROSCOPES,
6, COLEMAN STREET, LONDON,
M a r c h 1 8 5 3 .
T h e i r im p ro v e d fo rm o f S ta n d , w h ic h is c o n tr iv e d fo r a n e a sy a n d
m o s t a c c u ra te m o d e o f a p p ly in g e v e ry k in d o f illum in a tio n , w a s sh ow n
b y th em a t th e G r e a t E x h ib itio n o f 1 8 5 1 , a n d is th u s m e n tio n e d b y
th e J u r y :—
“ 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 Ulumination 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 o f th e Juries, pa. 266, Class X. No. 253.)
T h e in c re a s e o f th e A n g le o f A p e r tu r e , w h ic h S . & B . h a v e la te ly
e ffe c te d in th e i r O b je c t-G la s s e s , is m o r e e sp e c ia lly w o r th y o f n o tic e in
th e low e r p ow e rs , w h ic h , a d ju s tin g th r o u g h c o n s id e r a b le th i c k n e s s o f
g la s s , o r som e d e p th in to w a te r, w ill, w ith a la r g e a p e r tu r e , e x h ib it
th o s e o b je c ts w h ic h a r e t h e m o s t f r e q u e n t o b s e r v a tio n o f t h e n a tu r a l is t ,
w ith a d e f in itio n t h a t a sm a lle r a n g le o f a p e r tu r e c a n n o t g iv e. O n e o f
th e s e O h je c t-G ia s s e s , a f ^ t h s (e n -o n e o u s ly c a lle d “ h a l f - in c h ” ), is th u s
a llu d e d t o in t h e “ R e p o r t s o f th e J u r i e s o f t h e G r e a t E x h ib i t io n ”
(p a . 2 6 6 , C la s s X . N o . 2 5 3 ) ;
“ The half.inch focus of 70“ aperture is a wonderfully fine combination,
easily showing objects considered difficult for a one-eightli inch focal length
a little more than a year since, and bearing the application of the higher
eye-pieces in an unprecedented manner.”
L O N D O N : P R IN T E D BY T A Y L O R A N D F R A N C IS ,
RED LION COURT, F L E E T STR EET.