. Beck microscopes. Microscopes. Xo. No. 3357. Spot lens for low power dark field illumination, mounted to fit standard substage £10 0 ^\n? No. 3359 No. 3359. Beck aplanatic ring illuminator for the illumination of opaque objects with OWu/n/ng patit powers of l|in., § in. and ^in. The mounts cf the object glasses must be specially arranged to take the illuminator. The illuminator consists of a silvered glass ring of such curves that light thrown upwards from the flat mirror is condensed to a very perfect aplanatic focus. The illumination is exceedingly brilliant and is directed upon the
. Beck microscopes. Microscopes. Xo. No. 3357. Spot lens for low power dark field illumination, mounted to fit standard substage £10 0 ^\n? No. 3359 No. 3359. Beck aplanatic ring illuminator for the illumination of opaque objects with OWu/n/ng patit powers of l|in., § in. and ^in. The mounts cf the object glasses must be specially arranged to take the illuminator. The illuminator consists of a silvered glass ring of such curves that light thrown upwards from the flat mirror is condensed to a very perfect aplanatic focus. The illumination is exceedingly brilliant and is directed upon the object from all sides. Beck aplanatic ring illuminator for jjin. object glass 2 10 0 2 10 0 No 3365.^—Immersion ring illuminator for oil immersion object glasses with apertures up to For this purpose a special immersion object glass is made in which the whole front mounting is made of glass instead of meta) The glass mounting has an outer surface which is spherical in shape and concentric with the focus of the object glass so that the light from the aplanatic ring illuminator passes through without refraction. The glass front mount has a small aperture in its centre and into this aperture the front lens of the object glass is cemented, so that the portion of the front lens usually employed for mounting it into a metal cell is used for transmitting light to the object. The front surface of the front lens of the obicct glass is level with the front surface of the glass mount and the whole of this surface is in immersion contact \\ath the object when in use No. 3365. Immersion ring illuminator with 3 m/m. apochromatic object glass £20 0 0 No. 3365A. Ditto but with 3 m/m achromatic object glass 12 2 0 No. 33G7 Dark well for use with ring illuminators. This is mounted in a ring of the standard substage size and the well has an adjustment up and down and thus provides a suitable stop for obscuring the central beam of light from the mirror ...
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Keywords: ., bookcontributorgerstei, bookleafnumber89, booksubjectmicroscopes
