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The bracket is bolted to the U-strap as shown in Fig. Bracket is bolted to U-strap as picture shows you. Mirror assembly within the box. Household draw-drape rods were used. Spring automatically re- turns mirror to viewing position after each exposure. Adjustable brackets black control mirror position.

Microswitch is on the farther arm, behind the mirror. Mirror Assembly.

You need two rigid angle irons to support the mirror. I used extendable brackets intended to sup- port household draw-drape rods; these are easily extended to any desirable height. How- ever, plain angle-irons do just as well but be sure they are sturdy and firmly mounted. The mirror can be mounted in several ways. You may find it easier to mount the mirror on a piece of plywood, and then fasten the wood to the shaft used to rotate the mirror.

The long rod goes through the front panel, and a knob from a radio supply store is affixed to its end. Turning this knob tilts the mirror from side to side. Place a bit of rubber tubing on the rod first to prevent slippage. Tighten the clamp securely to the rod using the nut and bolt in the upper hole. A long spring, fastened to the lower hole of the clamp, is extended to the left wall of the box. Adjust the spring tension by altering its length and by adjusting the clamp until the mirror can be turned to the flash position but so that it will promptly flip back to its original position when the knob is released.

Rubber bands can be used instead of the spring, but these require periodic replacement. Mirror Adjustments. Although stationary stops could be used, better control of the light beams is obtained by use of ad- justable stops.

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I used two hinged metal brackets that had been used to support the end pieces of a drop-leaf table. These are easily modified to form efficient, rigid stops. ID ' DIA. For adjustable stops for mirrors, drop-leaf-table support brackets were used. See text for details of the modification. Filter system parts: two discs for 24 filters ; plastic coffee- can lids for spacers; spring, washer, nuts.

The nuts on the outside of the box are used to lock the brackets into place when properly positioned. Both stop brackets are identical in con- struction up to this point; the strike plates at- tached to them differ.

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The right stop is the simplest — nothing more than a lx2-in. A pressure-sensitive microswitch radio supply store is bolted to the inner side of the left bracket. This is a strip of sheet metal about 3 4x in. A bolt slipped through the tube section and bolted to the side of the bracket permits the trip plate to pivot up and down freely.

The purpose of the trip plate is to insure foolproof action of the tiny button on the rtiicroswitch when the mirror edge presses against the plate. A double lead wire from the microswitch terminals is run out through the shorter arm. The spring will be stretched to a screw-eye on the bottom of the box to provide a downward tension on the bracket.

Remove the butterfly mounting piece from the long arm only, and replace it with a metal U-shaped connector made from stiff sheet metal. Bolt or cotter-pin the U link to the arm of the bracket so that it can pivot freely. Drill two bolt holes through the front panel of the box as shown in Fig. Square nuts are better than hex nuts. The bolts are made from in-diam. The inner ends are filed down to form pins that project through holes drilled into the mid sections of the U linkages. Lay the bracket assemblies flat on the bottom of the box and screw the bolts out most of the way.

Fasten the butterfly mount- ings on the short arms to the bottom of the box and hook the springs to their respective screw-eyes. Now screw in the bolts, and the FIG. Angular bend near end of each arm drops into notches on discs. Flash mounting and front panel. Note 2 discs, mirror ex- posure knob, mirror adjustment bolts. Mirror reflects light from hole onto stage for over- head lighting. Note hood, light-tight seal used between microscope, camera. Filter Discs. Each complete disc assembly is made from two Masonite discs sandwiched together so that filters can be slipped between them.


The two disc assemblies are of slightly different diameters. Sandwich each matching pair together smooth sides out and fasten at the center with pieces of threaded tubing of the type used in table lamps and other electrical fix- tures hardware or electric supply store , using very thin nuts. Radio stores have thin nuts — or you can split an ordinary nut in half and file it smooth. Use a nut on each side of the assembly, tighten firmly, cut off all extra tubing, and file smooth.

If the paired discs do not lie perfectly flat against each other, use two or three small brads to hold them together.

Keep the brads in the inner part of the disc, away from the filter holes. To determine the position of the hole for the dial bolt Fig. Mark , and drill a Vi -in.

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Obtain a 1 IT -in. D for use as a bearing sleeve around the dial bolt which should be about in. Insert the bolt through the hole counter- sink the head and add the sleeve, forcing its end into the hole in the box top. Make two plastic spacers by drilling V4-in. Drop one of these onto the sleeved bolt rim outward then add the smaller filter disc, another plastic spacer, the larger disc, a short length of compression spring, washer, and two nuts. The discs should rotate smoothly and without undue wobble. Adopter construction details.

It wiil also be useful as a projection device. Springs attached to the other ends of the strips provide tension to keep the strips snubbed against the disc edges.

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To locate the notches on the disc edges, move the discs around to carefully center each hole over the hole in the box top. Mark these positions, and file the notches with a few strokes of asmall file. You can now place the panel back on the box by thrusting the projecting edges of the filter discs through the slots in the front panel Fig.

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  6. The types of filters you should add to the discs will be discussed later. Opaque-Specimen Illuminator. Your Dial- a-Flash will be far more useful if you make the simple adapter shown in use in Fig. The microscope is moved to one side from its normal position over the light hole. The extension bracket shown in Fig. Filtered light both viewing and flash emerging from the light hole is reflected onto the microscope stage by the adjustable mirror use your regular microscope mirror. The mirror can be moved up and down and swivelled about to obtain any angle of light- ing from a low grazing beam to a high ob- lique beam.

    The flat side of the mirror pro- vides soft lighting; the concave side provides an intense, concentrated beam.