No. 3515. Mechanical stage £10 10 0 
The construction of this stage can 
be seen from the illustration. It has a 
travel in the horizontal direction of 75 
m/m. and in the vertical direction 30 
m/m. It is fitted with scales and 
verniers for both movements.  Micro- 
scopes, Angular models Nos. 3878 and 
3879 are regularly fitted with tus stage. 
It can also be supplied to Nos 29, B, D, 
and C, and Combined ei and 
monocular Nos. 1335, 1336, 1337 
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No. 3305. \, 
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No. 3306, 
No. 3418. Diamond object marker 
This fits into the microscope like an object glass and has a diamond set into it, SO 
that a circle can be scribed upon the cover glass around any portion of the object which 
it is desired to mark. The diameter of the circle is adjustable. 
No. 3515. 
No. 3305. Mechanical stage £6 0 0 
This stage has both horizontal and vertical 
motions actuated by milled heads. The rack 
employed is very finely cut, which gives an exceed- 
ingly delicate and smooth motion. In the horizontal 
direction, the travel is 24 in. and in the vertical | in. 
This type of stage is supplied the Nos. 22 and 29 
London microscopes and to the models of the 
angular and combined binocular and monocular 
microscope which have plain square stages. It can 
be fitted to other instruments but in some instances 
a small charge for fitting is entailed. 
No. 3306. Concentric rotating mechanical stage, 
suitable for microscopes No. 29 H, 1341, 3192, 
3876 Be (0) 0) 
This stage has adjustable stops, so that a 
slide of any length from 4 in. to 14 in. can be held. 
It has a spring to hold the slide down to the stage, 
which can be turned aside when not 
required. It has two concentric milled 
heads, so mounted that there is no 
tendency for the motion of one tu 
affect the other. The horizontal range 
is 3in., the vertical motion lin. The 
stage is supplied with scales and ver- 
niers in both directiors for finding 
specimens or making measurements. 
When this stage is titted to existing 
instruments the standard substage 
apparatus must be made slightly 
longer to accommodate further extra 
thickness. 
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£210 0 
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