This device is intended to copy Polaroid images taken by a Polaroid Land Camera model 110 or 110A. It is essentially a scanner, with the camera that takes the scans separate from the scanner. This box contains a flash, a timer, and a mounting point to hold the camera and original photograph exactly in place. The exposure time of the copy is much longer than for the original image. Images that were taken under- or over-exposed can be fixed in copying by exposing for different amounts of time. The manual reccomends an exposure time of up to 25 seconds to improve a very under-exposed image, and an exposure time as little as 4 seconds to slightly darken an over-exposed image. The contrast of the copy can be decreased by decreasing the development time from 1 minute to 45 seconds.

The Argus Model A helped to popularize the 135 format of film in the United States. This was a low-cost camera at $12.50 in 1936 - around $290 in 2025 dollars. The camera body is made of bakelite, with apertures of f/4.5, f/5.6, f/8, and f/11 and a collapsible lens. This particular camera is in a leather case that flaps down for picture-taking, and has a short start-up manual with the inscription requesting its return if found. Serial Number: 15435

This video camera records to 8mm video format cassettes, and is capable of recording both video and sound. Videos can be played back to TVs or color monitors by AV inputs. Videos can also be watched back directly on the camera. Some edits can be done on the camera, such as recording title screens and inserting footage over other footage, for making more advanced home videos. This camera comes with a large case of accessories, and the soft-touch plastic on the camera body is beginning to degrade and become sticky.

Very similar to the King camera made by Rochester Camera Mfg. Co., this camera is distinguished by the direction of the springs on the back (two springs facing the other two, rather than all being in the same direction) and brass pieces on the side of the camera. This is a very large camera, though it could be folded if it were in better condition. On this particular camera, the bellows are ripped in a few places. Pictures it took would have been with glass plates, not film.

The Rexo 1A, manufactured between 1916 and 1931, was positioned as a lower-price alternative to the Kodak Autographic popular at the time. This camera folds into a rectangular shape for travel and storage, and uses 2.5/4.5 inch film. The lens is a F7-5 Rexo Anastigmat F 5 1/4 in lens, and it has an Ilex shutter.

DC Voltmeter 0.0 to 7.5 Volts Cat. No. 3057K, Serial No. 37257

Leeds and Northrup bench-top galvanometer Cat. No. 2500 F Serial No. 74215

Invented by Michael Faraday in 1831, his Faraday disk showed the connection between electricity and magnetism by producing an electric current between the center of the disk and its rim as the disk is rotated by a hand crank. The disk center and rim are connected to the terminals, the rim via a mercury bath on the base. The copper rim passes through the bath. This Faraday disk is a demonstration motor. With a battery or DC power supply connected to the terminals, the disk rotates due to the force on the moving charges produced by the magnetic field from the horseshoe magnet. We no longer use this demonstration to avoid possible mercury vapor emission due to electrical sparks at the copper-mercury connection.

Located on the Grinnell College campus and constructed in 1885, Goodnow Hall was the first building constructed after the devasting tornado of 1882. Goodnow was built with quartzite rock, at the time a rare material.  The architect was Stephen C. Earle;  E.A. Goodnow provided the $10,000 required for the construction.   Initially designed as a library and observatory, it became the home of the physics and mathematics departments following the construction of the Carnegie library in 1904.  A wooden cornice from the original library is on display in the Physics Museum The dome on the tower of Goodnow housed the Hsieh telescope, an Alvan Clark eight-inch refracting instrument.  Two precision Seth Thomas clocks, one set on sideral time and the second on solar time, in conjunction with a Fauth transit telescope, a Fauth chronograph,  provided accurate timekeeping.  The eight-inch objective lens on display in the museum is the only remaining remnant of the telescope. The small transit hut with the slotted roof beside Goodnow contained the transit telescope with telegraph connections to the Goodnow clock room with its two precision clocks and chronograph.  All are on display in the museum.  The Warner-Swasey filar micrometer used with the Hsieh telescope is also displayed in the museum. In 1926 leakage problems forced the removal of the tower observatory dome and astronomy disappeared from Grinnell's curriculum until the 1960's.  The current Grant O. Gale observatory with its 24-inch telescope was dedicated in 1984. After the physics department moved to the new Science Building, Goodhow housed the psychology department from 1954 until 1988.  Following a major restoration project in xxx which included replacing the limestone belts on the tower, the anthropology department moved to Goodnow.  In 2019 after the anthropology department moved to the new Humanities and Social Sciences Center, Goodnow awaits its next occupant.

Solenoid, constructed at Grinnell College

Type 13C

Serial No. 011781

Sine/Square Wave Generator Model IG-82