Printer for transposing stereoscopic negatives, for 45 x 107 mm plates.

The upper part of the printer holds the negative and positive plate. The lower part contains a clock mechanism to time the exposures, the hand is visible from the front of the instrument shielded by a yellow glass screen. At the rear of the lower part is an electric bulb. Between the upper and lower parts is a small yellow filter that hinges down during an exposure.

A flap at the front of the printer opens to load the plates, the central aperture, through which the exposure is made, is shielded by the yellow filter. The negative is positioned to the right of the chamber and the positive to the left.

After switching on the lamp the knob at the lower left of the printer is pulled out, this starts the clock mechanism but at present the hand is disengaged. To make an exposure a knob on the right of the printer is turned, this lowers the yellow filter allowing light to reach the plates and engages the clock hand. After the exposure the knob on the right is turned back, this raises the yellow filter and disengages the clock hand which returns to zero by means of a light spring. To make the second exposure the knob on the top left of the printer is pulled out, this moves the negative to the left, and a knob on the right is pulled, this moves the positive to the right.

The clock hand is connected to the mechanism by a simple clutch, turning the knob that lowers the yellow filter moves a rod, to which the hand is connected, backwards so that it engages with the clock. When the knob on the lower left is pushed in a leaf spring rests on a wheel in the clock and prevents movement.

Serial Number:

Notes:

Printer for transposing stereoscopic negatives, for 45 x 107 mm plates.

This is similar to the previous example but simpler in operation as the negative does not have to be moved. The negative is placed in the centre of the printer, there is an aperture behind each of the images. The positive plate is placed to the left and exposed an arm then pulls the positive to the right where the second exposure is made.

Serial Number:

Notes:

Transposing Frame for 45 x 107 mm plates.

Construction:

45 x 107 mm plates.

This was sold as an accessory for the Stereolette camera - a metal folding plate camera. It was advertised as the Primus Transparency Printing Frame, also made for 6 ¾" x 3 ¼" plates (though not called the Stereolette).

Construction:

• For 6 x 13 cm plates. Removable pressure plate.
• 3 ¼" x 6 ½" plates, made of walnut.
• 3 ½" x 5 ½" plates, made of mahogany, removable pressure plate. Similar models were made by Chadwick, (PA 1891, p. 552).

6 ½" x 3 ¼". Similar to the Hawkeye model shown below.

Construction:

6 ½" x 3 ¼".