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    • 1940s

    Electric-powered meter with instructions housed in wooden box. Movable components within box: two (2) slide glass filters (1 with red, green, and blue slides; 1 with orange, green, and blue slides); one (1) encasing to…

    • 1917

    A large, tapered, oval-shaped, clear glass bulb with a point on the top; has a brass bottom with threads on the end; attached to the inside of the bottom is a long glass tube with two terminals on either side and a long…

  1. Self contained pH meter with wooden exterior; hinged lid opens to reveal meter face and inlaid paper instructions for use; the dial is calibrated from pH 0 to pH 13 in .1 pH divisions; porcelain enamel lined electrode…

  2. Black finished cylindrical casing with three copper electrodes in a line next to product inscription; nickel knob is raised above the cylinder; outer dial goes from 0-15 (but only three digits are visible through its…

    • 1950s

    Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…

    • 1950

    Self contained pH meter with wooden exterior; hinged top door opens to reveal meter face and inlaid paper instructions for use; the dial is calibrated from pH 0 to pH 13 in .1 pH divisions; porcelain enamel lined…

  3. Wooden box with handle at top and metal latch closure at front; interior: instructions for use printed on paper and inset into box lid; top face: window at center reveals pH scale "7-14" and millivolts "0-400"; control…

    • 1938

    Self contained pH meter with wooden exterior; hinged top door opens to reveal meter face and inlaid paper instructions for use; the double scale reads pH and millivolts; hinged door on left side of wooden case opens to…

    • after 1933

    Rectangular wooden case with sloped top; black instrument panel on top surface; instrument panel features six connection posts for the external generator, a galvanometer meter under glass, nine black plastic knobs, four…

    • 1950 – 1959

    Wooden box with metal instrument panel on top; four small black rubber feet on bottom; front of wooden box contains printed instructions and folds down to show inside of instrument; rectangular wooden area attached to…

  4. Wooden box with black metal instrument panel; four padded metal feet on bottom; leather handle attached to side with two nickel connectors; nickel lock on side of base and lid; lid connects to base via two coated metal…

    • 1960

    Six volt galvanometer in a rectangular wooden case with rubber feet. A brass lever at the top of the case provides coarse zero adjustment; two black plastic and metal knobs on the right side of the case provide fine…

    • circa 1950

    Hardwood case with a leather handle and metal hinges and clasp; aluminium interior instrument panel has black finish; instructions on paper are inside the lid; the instrument panel features four black plastic knobs, two…

    • 1888

    Finished wooden box; four metal feet on bottom (box must be set on its side for instrument to function); top of box has two brass holders for missing handle and metal strip; side lifts up half way exposing a painted…

  5. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…

  6. Tall rectangular wooden base with black plastic instrument panel; instrument panel is attached to base via four metal screws, two on each side; two small black plastic knobs that adjust up and down as they are turned…

    • after 1944

    Wooden box with no lid; black painted metal instrument panel on top; engraved writing on top left corner; two metal knobs projecting from panel on upper right side most likely for running electrical current;…

    • circa 1960

    Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…

  7. Variable resistors are also known as potentiometers. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and…

  8. Variable resistors are also known as potentiometers. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and…

  9. Rectangular wooden box; brown leather handle attached to top with metal fasteners; front has a steel lock screwed to it; lock is stamped with manufacturer; four hard black rubber feet on bottom; top attached with two…

    • after 1888

    Direct current voltmeter, Model 1. Instrument mounted on brown felt on a hardwood base, with a brass tag in front; instrument made of metal and finished in orange-brown; two electrical connections covered in black…

    • 1950s

    Gold colored plastic box with a black circular grate and gold steel clips on the front; on the left top corner is a black plastic tone dial and on the right top corner is the volume dial; on the right side is a black…

    • 1954 – 1962

    Kodak brand Brownie Holiday Flash camera; Dakon plastic lens with rotary shutter; molded brown and tan Bakelite body; three metal sockets on right side of the camera body meant for mounting flash bulb; braided cord…