No. 3811. Substage, with focussing 
adjustment by spiral screw and 
swing-out movement {1 5 O 
a | No. 3285. Small Abbe condenser. 
| | A system of lenses mounted 
ML with an iris diaphragm, to fit 
the standard substage £1 9 6 
No 3285. No. 3285A. As No. 3285 with the 
addition of tray for colour screens 
and patch stops ... £1 14 6 
Ml 
I» 
No. 331). 
. 3285P. Set of 3 patch stops for above Jes LOS dono 
. 3286. Large Abbe condenser. A system of larger 
lenses in a fitting with a large iris 
diaphragm and a swing-out tray for colour 
screens or patch stops, with green and 
and ground glass screens... a ss 2 NOE +O 
. 3286P. Set of 3 patch stops for above ... Be ee O26 
. 3287. Beck dry achromatic condenser. 1 N.A., 
with standard object glass screw ... Ses 4 -4%,-.0 
. 3288. Beck dry achromatic condenser. 1 N.A., 
in fitting with iris diaphragm and swing-out 
tray, green and ground glass screens... pallor 0 
. 3291. Beck dry and immersion achromatic and 
aplanatic condenser. 1-3 N.A. in mount 
with iris diaphragm and swing-out tray 
with green and ground glass screens ahs 915 50 
. 3288P. Set of 3 patch stops for Nos. 3288 or 3291 des O76 
Yo. 3288. 
ee No. 3284. Travis expanding iris patch stop ... =e Om 
No. 3666. Quartz condenser for fluorescence work. This 
is corrected for a wave length of 2750 A.U. 
It is mounted in a fitting to suit the stan- 
dard substage or can be mounted on an 
Akehurst slide. It is fitted with an iris 
diaphragm... see aie zie we 13dsT00 70 
. 3667 Quartz condenser for fluorescence work. Simi- 
lar in construction to the Abbe condenser 
and mounted to fit the standard substage 410 O 
. 3668. Wood’s glass filter 2 in. square. This glass 
cuts out all visual light except the extreme 
red of which a very small portion is trans- 
mitted sie Ses He ie se 015 0 
No. 3678. Mirror with aluminium reflecting surface for 
ultra-violet light, 2 in. dia., flat, unmounted Leo 
Monochromator for giving beam of pure ultra-violet light 
Particulars and prices on application. 
a Objects being examined for fluorescence should be mounted 
No. 3284. on thin mica or quartz slips. Particulars 
and prices on application. 
79 
