Girl with toy Pordell Projector.

1918 Exhibit, Madison Square Garden, interior, Simplex projector.

Simplex machine.

200 Central Park West. American Museum of Natural History. Interior, planetarium [Zeiss projector.]

Toy projector.

Toy projector.

Simplex machine.

Simplex machine.

Simplex machine.

Girl with toy Pordell Projector.

Simplex film inspecting machine.

Simplex machine, general view.

Simplex Machine Co. Detail of Rheostat.

Simplex film inspecting machine.

View of Simplex automatic arc feeder.

View of Simplex automatic arc feeder.

Simplex machine with lamp house detail, interior lantern.

The Precision Machine Co. Simplex motion picture camera.

The Precision Machine Co. Simplex motion picture camera.

Simplex machine, general view with rheostat attached.