THE CAMBRIDGE 
SCIENTIfIC INSTRUMENT COMPANY, 
LIMITED, 
CARLYLE ROAD, CAMBRIDGE. 
Manufacturers of Physical Apparatus 
of every description. 
CATHETOMETER. 
The vertical support of this instrument 
is a weidiess steel tube, standing upon a 
tripod foot furnished with spirit-levels and 
levelling screws. The telescope has an object- 
glass 35 mm. diameter, is provided with rack 
and pinion adjustment for focussing, and a 
sensitive spirit-level. By turning a screw 
with a milled head the telescope itself may 
be placed absolutely level just before a 
reading is taken, without touching the 
levelling part of the whole instrument. The 
telescope is supported by a cord passing over 
a pulley and attached to a counter weight 
hanging inside the steel tube. This allows 
the telescope to remain in any position with- 
out clamping; a simple form of slow motion 
is also added. 
Dlustrated Catalogue of Physical and Electrical Instruments, also of 
Physiological Apparatus, sent Post Free on application. 
Address all communications to 
INSTRUMENT COMPANY, 
CAMBRIDGE, 
