A-A-54386
Provisions shall be made in the microscope to control the vertical movement of the condenser so that it does not make contact with the stage mounted microscope slide or the base mounted light source. In addition, a quick set condenser shall be supplied which allows the condenser to be lowered from a focused position and then returned to its original position by being raised to a positive stop.
The microscope shall be capable of accepting the following accessories which shall be commercially available from the manufacturer, but are not required to be supplied with the microscope:
1. A rotatable polarizer to fit the light source and an associated slide attachment to fit below the binocular body (head).
2. A paraboloid or oil immersion dark field substage condenser that is interchangeable with the substage condenser that is supplied with the microscope.
3. A dual viewing adapter with a built-in pointer, for use with the binocular body (head) that is supplied with the microscope.
4. A trinocular head for photomicroscopy, that is interchangeable with the binocular body (head) that is supplied with the microscope.
5. A 4X planachromatic objective for the nosepiece, with an auxiliary swing-in condenser for attachment to the fully substage condenser.
To eliminate vibrations during photomicroscopy, the fully assembled microscope (i.e., stand, accessory trinocular body with objectives, stage mount and substage condenser) shall not weigh less than 19 pounds.
The microscope shall be legibly and permanently marked with the name or registered trademark of the manufacturer, serial number and model number.
Workmanship. The microscope shall be free from defects which detract from its appearance or impair its serviceability.
Unit. Each (EA). One microscope, as specified, constitutes one unit.
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