This is a cardboard box filled with prisms in paper envelopes, most of which are sealed. There are ten prisms, and an eleventh envelope with…
This object is a wooden box divided into three felt-lined sections. It contains a number of unsorted glass prisms, pieces, and other optical pieces. One…
This is a cylindrical metal object closed at one end, with another tube emerging diagonally from its base. At the base there is a flat…
This object consists of a cylindrical disc piece mounted on an adjustable stand with a round base. In the cylindrical disc there is a small…
This object consists of a cylindrical disc piece mounted on an adjustable stand with a round base. In the cylindrical disc there is a small…
This object is a motor mounted on a wooden board with a wooden backplate. A long cable with a toggle switch and standard two-prong wall…
This is a small meter with several scales on the face. There is a metal indicator arrow. On the back, six long screws emerge from…
These are electric clippers contained in a cardboard box with a beige lid. The clippers have a brown plastic body, wider in the middle. At…
This is a rectangular piece of wood cut in a stepped fashion, with metallic plates attached to its broader surfaces. At one end, there is…
A brass and steel mechanism is mounted on a sturdy wooden base. The mechanism consists of two brass wheels, each with two open sectors, which…