BECK ELECTRIC LAMP. 
This lamp has been designed so as to provide a completely adjustable 
light source for all classes of microscopic illumination. It consists of a 
heavy circular base with an upright upon which the lamphouse moves in 
a vertical direction and upon which it also tips so as to alter the horizontal 
axis of the light. Both adjustments are provided with clamps. By means 
of the raising and lowering adjustment, the lamp can be placed in any 
position between 3 in. and 9 in. above the table. An adjustment is provided 
for the accurate alignment of the light source in the optic axis. The 
condenser can be focussed and clamped in the required position. Provision 
ms, is made for the accommodation of an iris diaphragm and colour screens, 
jf 2 in. square. The complete adjustments render the lamp suitable for use 
with all methods of microscopic illumination. A 60 watt Fullolite or 
Pointolite lamp can be employed as the illuminating source. The latter 
is strongly recommended for high power work, and especially for dark 
ground illumination. It is a very satisfactory illuminant, the source of light 
being a sphere of tungsten about 1/10 in. diameter, which when incan- 
<q descent, has extreme intensity. This lamp is supplied of 100 c.p. for 
%».. direct current, or 150 c.p. for alternating current, and is used in con- 
junction with a fixed resistance so that it is necessary to specify the 
No. 3332 voltage of the electric supply when ordering. 
No. 3303. Beck electric lamp, with condenser, ground and green glasses and 60 
watt Fullolite lamp ... Se dec ie ass SF Sec - 
No. 3332. Beck electric lamp, with condenser, ground and green glasses, 100 c-p. 
Pointolite lamp, and fixed resistance... Se aise ane soe, OMI 
No. 3330A. Beck electric lamp as No. 3332, but with Pointolite 150 c.p. lamp 
{610 0 
and fixed resistance ... Ose wb 5a S00 12; 2— 6 
No. 3680. Iris diaphragm ... io it sf ae se ae Rr ots 012 6 
No. 3681. Achromatic and aplanatic condenser in place of ordinary condenser, extra 0 10°26 
BECK INTENSITY MICROSCOPE LAMP. 
The illuminant is of great intrinsic brilliancy and is suitable 
for all microscopic work, including dark ground illumination. 
For direct current it is run from an ordinary house supply 
by means of a variable resistance on any voltage from 100 
to 250 volts. For alternating current a transformer is 
supplied to suit the voltage of the supply. Where electric 
supply is not available, accumulators or batteries of 12 
volts can be employed. The lamp is contained in a tubular 
housing and is provided with a focussing adjustment for the 
condensing lens. The lamp housing is mounted on a firm 
base, and can be adjusted for height and tilted to any 
angle, each adjustment being provided with a clamp. A 
ground and signal green glass are supplied with each outfit, 
also flex and connector to fit the standard sized bayonet 
lampholder. 
When ordering we require to have full details of the electric 
supply available. 
No. 3344. Beck Intensity lamp, on stand 
with condenser, one ground and 
one green glass, with resistance 
or transformer .. 
oS 
ise 
— 
No. 3344. 
No. 3344A. Ditto, but with iris diaphragm gis S2 ue 506 one os 
No. 3344B. Beck Intensity lamp, to work from.accumulators on 12 volt current 
No. 3344C. Ditto, but with iris diaphragm ae a 
No. 3344D. Spare bulbs ae ike ar nh Be ae we. 
No. 3682. Achromatic and aplanatic condenser in place of ordinary condenser, extra 
86 
each 
SCOrRW SD 
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TANWNwAO oO 
DBDAGHHOS © 
