BECK DRAWING APPARATUS. 
No. 3660 
The method of drawing objects, as seen through the microscope, by means of projecting an 
image on to the paper, is perhaps the most simple of any method. It requires no artistic skill, and it 
is simply the outlining of a picture which is actually projected on to the drawing paper. 
The difficulty generally arises in obtaining a sufficiently visible picture giving good contrast, 
and thus making the process of drawing easy and certain. The arrangement of the microscope, 
lamp, etc., also present some difficulties. 
We have, therefore, produced a self-contained apparatus with lamp, a platform for the 
microscope, right angle prism and drawing board. The apparatus is provided with 
adjustable curtains which exclude all extraneous light from the drawing board. These curtains are 
so arranged that they can be folded back, while the adjustments of the microscope are operated and 
let back in position while the drawing is being carried out. It will be found that with either of the 
illuminants which we list this apparatus can be used with any powers up to and including a 1/12th, 
and that even with the latter power when all light is shut off by means of the curtains, an image is 
projected which is quite sufficiently briliant to enable drawings to be made with ease. 
In ordering, the pattern of microscope should be specified, also the diameter of the eye end of 
the draw-tube over which the prism has to fit. 
No. 3660. Drawing apparatus, complete with Intensity lamp and _ resistance 
to work off any current from 100 to 250 volt. a = 216550" 0 
No. 3661. Extra for 100 c.p. Pointolite lamp and resistance to work off direct 
current 100 to 240 volt. ey See” 
No 3661A. Extra for 150 c.p. Pointolite lamp and resistance to work off alternating 
current 100 to 240 volt... we S63 Se ne si On O30 
No. 3662. Right angle prism only ... : ae a me ses ose Os) 
The prices do not include microscope, but include the cost of fitting 
customer’s microscope to the apparatus 
SUGGESTED COMPLETE OUTFIT. 
No. 3660. Drawing apparatus ar L1G LOE 0 
No. 29C, London microscope with rack and Pinion “focussing and 
centring substage (without case) ... 9 
No. 3260. 2 Eyepieces, 42 m/m. and 25 m/m. (x6 and x ‘10) 1 
No. 3231A. 3 in. Object glass, 16 m/m. ea sie a sc ye 0 
No. 3234A. 4 in. Object glass, 4 m/m. vs a ae e 2 lien 
No. 3251. in. Object glass, 2 m/m., oil immersion 3 
0 
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No. 760. Cedar oil bottle, with dipper, ground on cap and supply of oil 2 0 
No. 3285. Abbe condenser and iris diaphragm 10° 0 
No. 3301 Triple nosepiece ... me ce ee ast si seve 1 TOs 0 
£38 14 6 
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