Browse Items (70 total)

A simple consolidation of the tables of contents of the full run of the journal Rittenhouse, volumes 1 through 23 (numbers 1 through 70)

Physical descriptionFuncitonal description

A 38pp. manual of operation for this instrument.

Physical Description

Functional Description

Physical Description Two polarizing lenses on a hexagonal shaft.  The two lenses are each in a metal ring with a hexagonal handle, and the smaller of the two fits in the larger to make a double-ended (dumbell) object. The smaller of the two lenses…

Physical Description

Functional Description

Physical DescriptionA large pulley wheel in two slightly domed faces, the one communicating the axle of the pulley into a geared couting box with small dial ponters on either side.Functional DescriptionAs the cable passes though the main wheel, the…

Physical description: A nickeled brass surveyor's cross in a wooden fitted case. The cross consists of a cylinder with a compass on the top and a gimbaled socket on the bottom for mounting on a stake or tripod. The main body of the instrument…

Physical Description:

Machine is black, white and gray with a square base. The back of the base has several slots for the cords to be attached. On the back side is also a long thin piece of silver metal with inscriptions SERIE NR., U.S.PAT.…