AUTOMATIC ARC LAMP.

This forms a very satisfactory ilhiminant for microphotography, 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 current....................................£14 5 0

No. 3329A. Resistance 5 amp. for D 240 volts ........................

C. 200

No. 3329B. Resistance 5 amp. for D

No. 3329 120 volts ............

No. 3329C. Resistance 10 amp. for D.C. 200 240 volts No. 3329D. Resistance 10 amp. for DC. 100 120 volts

A special model of this lamp is made for alternating current.

C. 100-

1 10 9

2 12 6 1 10 0

Particulars on application.

2 17 9

CARBONS FOR ARC LAMPS.

No. 2171. No. 2172. No. 2173. No. 2174. No. 2175. No. 2176. No. 2177.

Carbons, best quality 6 m/m. for No. 3635 and 3636 ...

Carbons, best quality 8 m/m. for No. 3635 and 3636 .......

Carbons, best quality 7 m/m. for No. 3635 and 3636 .......

Carbons, best quality 5 m/m. solid for No. 3329A (5 amps.) .. Carbons, best quality 5 m/m. cored for No. 3329A (5 amps.).. Carbons, best quality 9 m/m. solid for No. 3329A (10 amps.) Carbons, best quality 9 m/m. cored for No. 3329A (10 amps.)

per doz. £0 2 3

„ „ 0 3 6

„ ,, 0 2 9

„ „ 0 3 6

, „ 0 1 10

„ 0 8 3

„ „ 0 6 0

LIGHT FILTERS.

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 colours... ...... 0 4 6

Wratten & Wainwright “ M ” Filters.

A series of filters suitable for visual observation or photography. They are of gelatine 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. X 2 in., in

cardboard box... £3 7 6^[

No. 3333A. As No. 3333, but of If in. or 1^- in. dia. ............................. 2 5 0*[j

Chance-Parsons Colour Filters.

This series of filters are of coloured glass. They have the advantage over gelatine filters, in that they will withstand heat. They are made to a thickness of 2^-3 m/m. A complete range of colours, neutral, orthochromatic and ultra-violet filters is available as follows.

No. 1 Ruby, No. 2 Red, No. 3 Deep Orange, No. 4 Light Orange, No. 5 Green, No. 6 Blue-green No. 7 Blue, No. 8 Purple, No. 9 Daylight, No. 10, Dark Neutral, light transmission 7*3%, No. 11, Light Neutral, light transmission 23T%, No. 12, Dark Orthochromatic, No. 13, Light Orthochromatic. No. 14, Ultra-violet, isolating wavelength of 3000 4000 A.U.

No. 2186. No. 2187. No. 2188. No. 2189. No. 2190. No. 2191. No. 2192. No. 2193.

Chance-Parsons filters, 2 in. X 2 in., all colours 1-—13 each £0 3 0

Chance-Parsons filters, 2 in. X 2 in., all colours 1—13, worked ... each 0 5 0

Chance-Parsons filters, 2 in. X 2 in., No. 14 ... each 0 10 0

Chance-Parsons filters, 2 in. x 2 in., No. 14, worked each 0 17 6

Chance-Parsons filters, 1^-in. or If in. dia., all colours 1—13 ... each 0 2 6

Chance-Parsons filters, 1^- in. or If in. dia., all colours 1—13, worked each 0 4 6

Chance-Parsons filters, 1^- in. or If in. dia., No. 14 ... ... ... each 0 6 6

Chance-Parsons filters, l^-in. or If in. dia., No. 14, worked ... each 0 10 6

89

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