This is a Bausch and Lomb EM-14 Dynazoom Trinocular Metallurgical Microscope with Trivert Illuminator.

This is a 'not-quite-complete' Bausch & Lomb Dynazoom metallurgical microscope that has been modified for the observation of extra opaque samples. This was accomplished by the addition of a spacer block which raises the limb about an inch higher from the base. The stage carrier has been modified so the stage sits a similar distance further from the viewing head, thus providing extra room for the vertical illuminator assembly.

These microscopes are very modular, so it is helpful to state how this one is configured. The stand itself features a low-set coaxial coarse and fine adjustment mechanism that is comfortable to use with the hands resting on the table surface. The stage is the plain type without any mechanical stage attachments. It is provided with a fixed condenser sleeve underneath the stage into which a simple single-lens condenser and iris have been clamped. The condenser does not appear to be factory original.

The base of the stand includes an optional hi-intensity illumination housing with a lamp socket. This housing has a centerable field iris diaphragm with built-in filter recess. There is no transformer for the transmitted light illumination, it will need to be sourced elsewhere. The plug on the end of the transmitted light socket is missing.

The stand is provided with the most elaborate version of the many tubes that were available for this instrument. This microscope tube has binocular observation and a control knob to switch the light path into a port on the top of the tube. It also features a 1x to 2x continuous zoom mechanism that operates in both the photo and binocular ports. The zoom knob is graduated. The microscope pod may be turned through 180 degrees so the limb of the stand may either be away from or close to the observer (the vertical illuminator prevents continuous rotation). A pair of B&L 10x wide field oculars is supplied as is a photo-port adapter collar. This collar would be used with various shutter housings that Bausch & Lomb manufactured for their camera systems. No cameras are included.

The vertical illuminator is the most elaborate of the several Bausch & Lomb provided for the Dynazoom. Called the 'Trivert', it has provisions for bright field, dark field, and (when so optioned) polarized light. Please note that no polarized light accessories are included with the equipment! The illuminator has separate field and aperture diaphragms and a slot for receiving filters. A selector knob next to the beam-splitter swings in a central stop for observations in dark field (field and aperture diaphragms must be fully opened). This illuminator is missing the socket for the lamp (it was tested with the socket from another instrument). Also missing is the Jeffey transformer for regulating the missing GE 1630 low voltage lamp.

The base of the illuminator carries a quadruple nosepiece positioned away from the observer allowing better viewing of the specimen. The objectives are all of a special version with annular lucite collector lenses for the dark field illumination. The objective threads are actually turned into the lucite eliminating the need for a special large-thread objective all threads are standard RMS 20mm. One port is vacant. The three 215mm tubelength objectives include:

8x / 0.20 working distance 0.530 inches, largest field-of-view 0.093 inches
20x / 0.40 working distance 0.035 inches, largest field-of-view 0.036 inches
40x / 0.65 working distance 0.030 inches, largest field-of-view 0.018 inches

As far as it goes, the stand is in really fine condition cosmetically. The microscope body has been completely rebuilt so the binocular portion interpupillary system works smoothly as well as the zoom mechanism and the viewing port selector. Binocular alignment was touched up so both eyepieces are perfectly coincident. Regarding mechanical condition, the fine focus adjustment is a bit stiff, but functional. It should be relubricated for best functionality sometimes the stiffness is such that the coarse adjustment knob begins to turn along with the fine. The coarse adjustment is working very well. Optically, the diaphragms in the Trivert illuminator are not perfectly aligned nor are the objectives exactly parfocal. I will leave it up to the purchaser to correct these things should they wish to do so.

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