8 
No. 30a BINOCULAR “ECONOMIC” MICROSCOPE, 
As Figured ; 
With Two Pairs of Eye-Pieces; Three Object-Glasses 2-inch, 
1-inch, and J-ineh; Plane and Concave Mirrors; Iris 
Diaphragm ; Forceps ; Pliers ; Slip with ledge. 
PACKED IN POLISHED MAHOGANY CASE, 
e£10 IOs. 
Double Nose-piece, 12s. 6d. ; Triple Nose-piece, 24s. extra. 
NEW 1/12 INCH OIL-IMMERSION OBJECT-GLASS, £5 10S. 
FULL ILLUSTRATED DESCRIPTIVE CATALOGUE FREE ON APPLICATION. 
R. & J. BECK, Ltd., 68 Gornhill, London, E.C. 
FACTORY: LISTER WORKS, KENTISH TOWN, N.W. 
