Bauhaus-Universität Weimar

Cambridge Instrument Company, Inc.: Cambridge Physical Instruments
Fig. 2. 
43 X 15 X 25 I 
^HE -Measuring Microscope 
shown in Fig. 2 is an instru¬ 
ment for the accurate measure¬ 
ment of lengths up to 40 
millimetres, and gives readings 
directly to 0-01 millimetre, or, by 
estimation, to 0-001 millimetre. It is 
designed throughout upon geometric 
principles, and combines the precision 
of a scientific instrument with the 
simplicity and robustness of a workshop 
tool. The instrument consists of a 
microscope clamped to a tube, which is 
supported in a rigid frame, and can be 
traversed by a screw and milled head 
through a distance of 40 millimetres. 
The microscope, which can be clamped 
in position at any point along the tube, 
and at any angle in a plane normal to 
the tube, is fitted with an achromatic 
objective and suitable eyepiece with cross lines. It is provided with a slow motion focussing 
mechanism, which gives a smooth movement, and is entirely free from backlash. The object under 
examination can be supported upon a small sliding table, which rests on geometric fittings, and is 
provided with aligning adjustments controlled by screws. Small V blocks, on geometric supports 
fitting this table, are provided to take screws, cylinders, etc. A rotating table can also be supplied 
to enable measurements to be made in polar co-ordinates. When it is desired to use the Microscope 
for measuring vertical distances, the instrument can be provided with a tripod base with levelling 
screws, so that the microscope may be traversed vertically. 
The Microscope is capable of many applications in the laboratory and the workshop ; it may be 
employed, for example, to determine the diameter of the indent¬ 
ations made in the Brinell hardness test, and the change in 
length of specimens of steel after hardening ; to measure test 
pieces after mechanical strain in order to determine elastic 
limits and yield points ; to measure the pitch of small screws, 
and the variations in pitch from one part of the thread to another. 
It can also be used to advantage for accurate length measure¬ 
ments difficult to obtain by other methods. 1 he addition of 
a goniometer eyepiece to the microscope in place of the ordinary 
eyepiece enables the instrument to be used also for determining 
the angle of V threads. For this purpose the microscope is set 
so that one of the cross lines coincides with one side of the V 
(see Fig. 3), and a reading is taken on the divided circle of 
the goniometer eyepiece. The eyepiece is then rotated until 
the cross line coincides with the other side of the V. The angle 
through which the eyepiece, has been rotated, as shown by the difference between the two leadings 
on the divided circle, gives directly the angle of the A to within 5 minutes of arc. 
Cat. No. Fig. No. 
31137 2 Measuring Microscope. 
31139 Tripod for above. 
Fig. 3. 


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