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The DZ 9 M diamond microscope

Fig 155 The DZ 9M diamond microscope (Firm Schneider) The diamond microscope consists of a box base with built-in illumination optics. This illumination has been specially designed and built for the examination of diamonds (Fig 155).
The box base has a column, to which is attached a stereo zoom barrel of the Firm Carl Zeiss. The lamp is built into the box base and can be replaced by removal of the rear panel. The illumination optics and the lamp are matched so that. light passes through the diamond and shows all inclusions.
The microscope barrel is provided with objectives with stepless adjustment which are located on either side of the barrel.

The instrument is fitted with two wide-angle 10 x eyepieces as standard equipment. Interocular distance is adjusted by a widening or narrowing of the distance between both eyepiece barrel tubes. Total magnification is obtained as follows. The magnification of the pair of eyepieces used is multiplied by the adjusted magnification of the objectives (this can be read from the white markers). For example, with a twofold magnification of the objective (the number "2" is located beside white marker) multiplied by a 10 x pair of eyepieces, the total magnification is 20 x.

On the right side of the base of the instrument there is a switch, while on the left side there is a control knob for regulating the light intensity. The two pairs of tweezers attached are used for examining fancy cuts, gemstones, and set stones. The instrument is also provided with an automatic voltage selector. It can be used on 100 to 240 volts A.C. at 50 Hz and 60 Hz. The voltage is automatically selected as soon as the' plug of the instrument is inserted. into the power outlet. The microscope also has a cable lead of 1.5.m to a transformer via plug connection. This transformer produces the voltage of 15 volts needed to operate the lamp. An illumination strength of 9,000,000 lux is produced, when the highest possible light intensity is selected. Despite this high light intensity, there is no dazzle effect while the diamond is being examined. For a considerable increase in lamp life it is advisable to step down the intensity considerably and to adapt it to the stone which is to be examined.

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