. Beck microscopes. Microscopes. No. 3296. High power dark ground immersion illuminator, in plain substage fittng No. 3297. Ditto, in centring substage fitting This illuminator throws upon the object a hollow cone of light between 1 and It must be used in immersion contact with the slide and the slide must be 1 m/m. thick or the light will not be in focus. It is specially intended for use with object glasses of high power, as it gives a very small but brilliantly illuminated spot of light. Oil immersion object glasses such as the 3 m/m. with an aperture of .95 can be used with it, but
. Beck microscopes. Microscopes. No. 3296. High power dark ground immersion illuminator, in plain substage fittng No. 3297. Ditto, in centring substage fitting This illuminator throws upon the object a hollow cone of light between 1 and It must be used in immersion contact with the slide and the slide must be 1 m/m. thick or the light will not be in focus. It is specially intended for use with object glasses of high power, as it gives a very small but brilliantly illuminated spot of light. Oil immersion object glasses such as the 3 m/m. with an aperture of .95 can be used with it, but lenses with a greater aperture require to be stopped down by the insertion of a diaphragm No. 3297. behind the back lens. No. 3482. Pinhole diaphragm for centring, in mount with standard object glass thread ... For particulars of special holders for dark ground illumination see page 99. £2 10 0 3 5 0. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Beck (R. & J. ) Ltd. London : Beck
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