. Beck microscopes. Microscopes. No. 3644. Dark ground illuminator for low and moderate powers ^5 0 0 This illuminator is for use with object glasses the numerical aperture of which is not greater than -65 It is made somewhat on the principle of an ordinary substage condenser but has a specially long working distance, ft is provided with an iris diaphragm for transmitted light in the usual manner. When the iris diaphragm is opened to its fullest extent and the tray g^^^^^^g """"'^'^^^ M mm/ is swung aside, a special stop can be folded in, which «*"â 'ismM^^ M Mm/
. Beck microscopes. Microscopes. No. 3644. Dark ground illuminator for low and moderate powers ^5 0 0 This illuminator is for use with object glasses the numerical aperture of which is not greater than -65 It is made somewhat on the principle of an ordinary substage condenser but has a specially long working distance, ft is provided with an iris diaphragm for transmitted light in the usual manner. When the iris diaphragm is opened to its fullest extent and the tray g^^^^^^g """"'^'^^^ M mm/ is swung aside, a special stop can be folded in, which «*"â 'ismM^^ M Mm/ converts the apparatus into a dark ground illuminator. A neutral glass screen is supplied to tit into the tray, in order to reduce the necessarily strong light required for dark ground illumination to an amount suitable for ordinary transmitted light. With this illuminator, dark ground illumination can be used with all powers up to \ inch (4 m/m) provided the object glass has not an aperture exceeding Xo. 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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Keywords: ., bookcontributorgerstei, bookleafnumber89, booksubjectmicroscopes
