WATSON’S 
BINOCULAR MAGNIFIERS 
Mounted in Adjustable Spectacle Frames 
all those whose work is assisted by magnifiers. 
They are specially advantageous for Dissecting, Natural History 
Work, Pond Life, operations on delicate structure, fine machine 
The lenses are Achromatic, giving a beautifully sharp flat field, 
together with a stereoscopic effect, and freedom from all strain on 
the eyes. 
WATSON’S CATALOGUE OF MICROSCOPES is published in the following parts : 
“SPEERA” 
The system of construction is simpler and better than anything 
previously devised, and their immense utility, together with the ease 
of adaptation and comfort in working, has made them popular with 
This Binocular Magnifier is made in three different foci, 5 ", 7 " and 
10”, giving magnifications of 3.5, 2.5 and 1.75 diameters respectively. 
work, watch repairing, etc. 
Price £2 0 0 per pair 
Your local Optician will fit and supply Watson’s “SPEERA” 
Binocular Magnifiers. 
