10 
W. WATSON & SONS’ 
Grand Model” van Heurck Microscope, 
FOR HIGH-POWER WORK AND PHOTO-MICROGRAPHY, 
Constructed on exactly similar lines to our “ B ” van Heurck 
Microscope, but has the following special features: — 
STAGE can be rotated completely in any position. 
Mechanical movements of Stage controlled by 
two stationary milled heads, working on one centre. 
Optical centre, when the instrument is set hori- 
zontally, io inches high. 
Spread of tripod ifoot, over io inches in each 
direction. 
Fine adjustment to Substage. 
Rackwork and Sliding Drawtubes. 
Full description of the above instrument, and 
Illustrated Catalogue of Microscopes and Appa- 
ratus, also classified list of 40,000 Micro- 
scopic Objects, forwarded post free on application 
W. WATSON & SONS, 
313 HIGH HOLBORN, 
LONDON, W.C., 
AND 
78Swanston Street, 1 
Melbourne, 
Australia; * 
