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 is made for the accommodation of an iris diaphragm and colour screens, 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-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 conjunction with a fixed resistance so that it is necessary to specify the voltage of the electric supply when ordering.

Beck electric lamp, with condenser, ground and green glasses and 60

watt Fullolite lamp................................................

Beck electric lamp, with condenser, ground and green glasses, 100 c.p.

Pointolite lamp, and fixed resistance ......... ............

No. 3330A. Beck electric lamp as No. 3332, but with Pointolite 150 c.p. lamp

and fixed resistance.............................................

No. 3680. Iris diaphragm........................................................

No. 3681. Achromatic and aplanatic condenser in place of ordinary condenser, extra

BECK INTENSITY MICROSCOPE LAMP.

No. 3332

No. 3303. No. 3332.

£6 10 0

10 17 6

12 2 6

0 12 6

0 10 6

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............................ ... £4 15 0

No. 3344A. Ditto, but with iris diaphragm ......................................... 6 0 0

No. 3344B. Beck Intensity lamp, to work from accumulators on 12 volt current 3 7 6

No. 3344C. Ditto, but with iris diaphragm ... ....... ................. 4 12 6

No. 3344D. Spare bulbs .............................................each 0 2 6

No. 3682. Achromatic and aplanatic condenser in place of ordinary condenser, extra 0 7 6

86

---

Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 99,61 %.

La langue de reconnaissance de l'OCR est l'Anglais.

---