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FIG. 4: Three-celled battery box, turning out 18 volt current, is connected in series by copper plates on cover. Note handle.
center point of the lens is directly above a point on the baseboard which is midway between the two edges of the baseboard. In locating this point, be absolutely certain that the sides of the camera remain parallel with the sides of the baseboard.
Now, with the camera in the position described above, trace the outline of the camera base on the baseboard. Remove the camera and locate the position of the tripod socket inside this outline. Careful measurements with a ruler will make this easy. (For Sportster owners, the center point of the tripod socket is at a point 2% inches from the rear edge of the baseboard and 1 inch in from the right hand edge looking forward from the rear.) Through this point drill a hole of Yi inch diameter. Now attach the camera firmly to the base with a Y± by 20 bolt lYi inches long, by pushing the bolt up through the hole in the baseboard and screwing it into the tripod socket of the camera. Here again be certain that the camera is parallel to the edges of the baseboard.
Now fasten small cleats to the baseboard along both base edges of the camera. Such cleats will make it impossible for the camera to rotate about the tripod screw and thus will assure accurate placement of the camera each time it is fastened to the baseboard. For the Sportster, small metal strips about 1/16 of an inch thick and
FIG. 5: Bird seed on a rustic log will attract winter birds to your operating theatre. With 3x lens, camera distance is 5-6'.
FIG. 6: Suet nailed to a sunlit tree here lures a downy woodpecker before the closeup camera. Bluejays also are good show.
Y& of an inch wide (as pictured in Fig. 2) will serve admirably for this purpose. Other cameras may require thicker or longer cleats, depending upon the shape and size of the camera base. Finally, on the underside of the baseboard attach a piece of steel Yk °f an inch thick into which a Yk by 20 hole has been tapped so that the whole unit may be mounted on a tripod. For a small charge, any local machine shop will make this piece of tapped steel if you do not have the means to do it.
PICTURE this robin family in action on your own home screen! Closeups like this are easy with remote control unit described.
MAGNET TRIPS RELEASE LEVER Mounting the magnet which trips the release lever is simplicity itself. Illustrated in Fig. 3 is an antiquated magnet — one used in the early days of flash synchronization for still cameras. The magnet itself is enclosed in a metal box which is fastened with the knurled bolt to a metal bracket attached to the baseboard (see also Fig. 2 ) . The metal bar protruding at the upper end of the box is pulled downward whenever current passes through the magnet; and as it goes down it presses the release lever on the camera into operation. The camera continues to operate until the current is turned off; then the bar springs up and the camera stops.
Since the release lever on Bell & Howell cameras requires but little pressure to operate, this magnet works exceedingly well. Other makes and models of cameras may require more pressure to operate their release levers. And, of course, magnets [Continued on page 93}