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No. 3420. 
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No. 
No. 
No. 3610. Hand centrifuge, with head 
carrying two buckets, two graduated 
tubes, clamp for fixing to table. This 
machine is strongly made, and can 
attain a speed of 2,500 r.p.m. ... 
No. 3611. As above, but with four 
buckets and tubes a 
No. 3612. Extra tubes, graduated each 
No. 3613. Extra tubes, plain per doz. 
machines given on application. 
No. 3420. Live box. This consists ofa 3x 1 
ebonite slip with a metal tube, the top 
of which contains a thick glass plate. 
Over this fits a cell with a thin cover 
glass so that the material being exam- 
ined is held between the two glasses 
3421. Beck compressor. The Beck compressor is 
a3 x1in. plate of glass at one end of which a circular 
pillar is fixed. This pillar carries an arm which holds 
a cover glass. The arm is raised or lowered by 
a screw at the top of the pillar, which mechanically 
varies the space for holding the specimen. The arm 
carrying the thin glass can be swung to one side for 
placing the specimen in position and then lowered 
to the required amount 
. 3320. Rousellet’s compressor. This is some- 
what similar to the Beck compressor but the 3x 1 
plate is brass with a circular glass plate in the centre, 
and the upper glass is cemented to the brass arm 
. 3321. Rousellet’s live box. This is similar in 
construction to No. 3420 but the glass plate is level 
with the stage and it is therefore suitable for use with 
substage apparatus 
. 3416. Beck glass trough, consisting of a 3xl 
glass slide which has two clips and clamping screws. 
By means of these, thick or thin cover plates are held 
on to the 3x1 slide with a separating band formed 
by cutting an ordinary rubber band in half. Various 
thicknesses of separating bands may be used 
3422. Stage forceps. A 3x1 platecarries a metal 
fitting holding a short revolving rod with a pair of 
spring forceps at one end and a tube with cork at 
the other 
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