Antique brass microscope Carl Zeiss Jena Nr 201332 lens *10 vintage is very rar For Sale

Microscope Carl Zeiss Jena No. 201332 in working order, without packaging, without accessories.Carl Zeiss Jena microscope without kit. With missing parts. Material - brass. Year of manufacture approx. 1930. Microscope objective * 10. DESCRIPTION:The microscope is a modified drum-type. The foot is round and black and has a semicircular depression for the subject\'s finger. A metal rail arising from the foot forms the vertical support for the microscope via a sliding dovetail fitting; coarse focus is effected by sliding the instrument up or down on the dovetail, and then using the setscrew on a knob to lock it in place. Fine focus is achieved by rotation of the body tube. The instrument has a 10X eyepiece and a 6X objective giving a final magnification of 60X. A port angled towards the center of view comes in from the side. This is designed to allow a light source to be placed inside it. This kind of angular top-lighting allows good visualization of the skin withut glare or undue reflection. The original light source, (no longer present) would have been powered by a pair of wires attached to a separate battery, or as the instructions say, via a resistor to a higher voltage source such as AC household current. In use, a finger is placed in the depression on the foot, the skin of the base of the nail (\'nail fold\') is covered with oil (to act as a clarifying agent) and the microscope is gently lowered until just touching the skin. Fine focus then allows visualization of the capillaries, though critical focus requires the subject to hold very still. This instrument has a narrow depth of focus; this is a disadvantage as discussed below.
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