MICROSCOPES— (contd.)

Grand Model Van Heurck Microscope—continued.

In addition there is the interchangeable rackwork substage fitted with complete Swift petrological and ordinary achromatic condensers having sector diaphragm, two revolving selenite holders, four colour-filter holders ; it is fitted with centring screws. Large-size plane and concave mirrors.

In order to make the instrument portable the tripod foot on which it is mounted is provided with two hinged legs, but in spite of this it is as rigid as the fixed pattern.

Eyepieces, Achromatised, one pair “ B.”

One pair Zeiss compensating X 12.

Objectives, Zeiss Apochromatic 24-mm., 0.30 N.A., 250-mm. tube length.

Zeiss 4-mm. 0.95 N.A., with correction collar. Powell & Lealand 1 /8" with correction collar, dry and immersion fronts.

Powell & Lealand 1/12" oil-immersion, with correction collar.

One colour-filter holder.

Powell & Lealand oil-immersion condenser.

Watson Universal achro-aplanatic condenser.

Bull’s-eye stand condenser.

Bull’s-eye condenser, mounted for fitting to limb.

One pair stage forceps.

One silver side reflector.

Travis expanding stop.

Set of stops for Powell & Lealand immersion condenser.

Double nose-piece, by C. Baker.

Two compressors.

Set of dark-ground stops for Universal condenser.

Set of selenites, dark-ground stops, for Swift condenser.

Drawing prism to fit on to eyepiece.

The whole, complete in polished mahogany case with carrying handle, lock and key. Price

The is unique and represents the ideal equipment for any amateur microscopist ; it could be adapted to any form of microscopical work.

Circuit Stage Van Heurck Microscope, by W. Watson Sons, Ltd., with :—â– 

Interchangeable monocular and Wenham binocular bodies, the monocular body having two draw-tubes, one with rackwork adjustment and the other sliding ; the binocular body being fitted with rackwork adjustment for interpupillary distance.

Rackwork coarse adjustment.

Horizontal lever fine adjustment.

Built-in mechanical stage, having rotation through 360°, movements, i-|-"xi|", sliding bar.

Rackwork focussing substage with centring screws, fine adjustment focussing motion.

Plane and concave mirrors.

Tripod foot.

One pair eyepieces B X 6.

One pair eyepieces C X 8.

One eyepiece E x 12, best capped pattern.

Objectives, 16-mm. Holoscopic, N.A. 0.45.

12-mm. Holoscopic, N.A. 0.65.

4-mm. Holoscopic, N.A. 0.95.

2-mm. oil-immersion objective, Homogeneous immersion, N.A. 1.25.

All objectives corrected for 250-mm. tube length.

( 3 )

£ s. d.

75 0 0

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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 98,73 %.

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

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