. Beck microscopes. Microscopes. AUTOMATIC ARC This forms a very satisfactory illuminant for micro- photography, projection, dark ground illumination, etc. etc. The automatic mechanism relieves the operator of all trouble except that of switching on and off. No. 3329. Automatic arc lamp, 5-10 amperes, for direct £14 5 0 No. 3329A. Resistance 5 amp. for 200- 240 volts 2 17 9 No. 3329 No. 3329B. Resistance 5 amp. for 120 volts 100- No. 3320C. Resistance 10 amp. for 200 240 volts No. 3329D. Resistance 10 amp. for D C. 100 120 volts A special model of this lamp is m
. Beck microscopes. Microscopes. AUTOMATIC ARC This forms a very satisfactory illuminant for micro- photography, projection, dark ground illumination, etc. etc. The automatic mechanism relieves the operator of all trouble except that of switching on and off. No. 3329. Automatic arc lamp, 5-10 amperes, for direct £14 5 0 No. 3329A. Resistance 5 amp. for 200- 240 volts 2 17 9 No. 3329 No. 3329B. Resistance 5 amp. for 120 volts 100- No. 3320C. Resistance 10 amp. for 200 240 volts No. 3329D. Resistance 10 amp. for D C. 100 120 volts A special model of this lamp is made for alternating current. CARBONS FOR ARC LAMPS. 1 10 9 2 12 6 1 10 0 Particulars on application. No. 2171. Carbons, best qualitv 6 m/m. for No. 3635 and 3630 No. 2172. Carbons, best quality 8 m/m. for No. 3635 and 3636 No. 2173. Carbons, best quality 7 m'm. for No. 3635 and 3030 No. 2174. Carbons, best quality 5 m/m. solid for No. 3329A (5 amps.) .. No. 2175. Carbons, best quality 5 m/m. cored for No. 3329A (5 amps.).. No. 2176. Carbons, best quality 9 mm. solid for No. 3329A (10 amps.) No. 2177. Carbons, best quality 9 m/m. cored for No. 3329A (10 amps.) LIGHT FILTERS. per doz. £0 2 3 0 3 6 0 2 9 0 3 6 0 1 10 0 8 3 0 6 0 Beck Colour Filters. These filters are of dyed gelatine cemented between glass plates, and comprise the following colours : red, orange, green, blue-green, blue and purple. They are suitable for both visual and photographic work. No. 3346. Beck colour filters, set of six, 2 in. x 2 in., in cardboard case £1 5 0 No. 3347. Single filters, 2 in. x 2 in., in any of the specified 0 4 6 Wratten & Wainwright " M " Filters. A series of filters suitable for visual observation or photography mounted between glass plates, the range of colours being: orange red, green, blue-violet, purple, orange, pure red, strong yellow, blue, pale yellow. No. 3333. Wratten & Wainwright's " M " filters set of nine, 2 in cardboard box ... No.
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Keywords: ., bookcontributorgerstei, bookleafnumber97, booksubjectmicroscopes
