A-A-54386
The base shall have built-in a variable light source (illuminator) for operation from AC supply lines through a power cord. The light source shall be a 6 volt, 20 or 30 watt tungsten halogen lamp. The circuitry for the light source shall include a continuous voltage (intensity) control, on-off switch and transformer. The lamp shall be supported in a lamp socket which has the facility for easy replacement of the bulb. The power cord shall be a flexible 3-conductor cord that terminates with a non-detachable 3-blade male plug. The illuminator shall have a filter holder with a removable blue filter and a built-in field diaphragm for Koehler illumination.
The mirror and fork assembly shall be attachable to the base, for outside field use where AC facilities are not being used.
The stand shall house the focusing mechanism, and shall be attached to the base. The supporting arm of the stand shall support the binocular body. The focusing mechanism shall raise and lower the nosepiece assembly or stage. The focusing mechanism shall include coarse and fine controls that are manually controlled by coarse and fine knob (dials) located in the lower position of both sides of the stand. For purposes of measuring specimen thickness, the fine adjustment shall be graduated in one (1) or two (2) micrometer divisions with one complete revolution representing 100 micrometers as a minimum. For protecting an objective and specimen (slide), an adjustable mechanical stop shall be included in the stand to limit the travel of the coarse control. In addition, a safety clutch shall be included to stop the travel of the fine control mechanism in the event the operator continues to turn the fine control when the objective makes contact with a slide or its top mounted cover slip.
The binocular body (head) shall have eyepiece tubes with 10X wide field eyepieces and eyeguard relief. The eyepiece tubes shall be inclined 30-40 degrees from the horizontal. The interpupillary distance (between eyepiece tubes) shall be adjustable within a range that includes 56 to 72 millimeters (mm). The interpupillary adjustment shall include a millimeter scale for easy reference. Automatic tube length compensation shall be included if the tube length is affected by changes in the interpupillary settings. The eyepiece tubes shall include provisions for installing micrometer discs. One eyepiece shall be focusable for acuity equalization of a user’s eye. The eyepieces shall have a minimum 18 mm diameter field view and a minimum eye relief distance 18.7 mm. The binocular body shall be 360 degrees rotatable on the supporting arm (stand). The binocular body shall also be detachable for interchangeability with heads (e.g. a trinocular body for photomicrographic procedures).
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