spare motors (7) for marginal oscillator
Date: mid 20th-late 20th Century
Inventory Number: 2004-1-0408f
Classification: Nuclear Magnetic Resonance
Subject:
Maker: Bodine Electric Company (1905-present)
Maker: Hurst Manufacturing (founded 1950)
User: Department of Physics, Harvard University (founded 1884)
Associate Name: Robert V. Pound (1919 - 2010)
Cultural Region:
Dimensions:
average motor: 6 x 6 x 10 cm (2 3/8 x 2 3/8 x 3 15/16 in.)
Description:
Various replacement motors for the electromechanical drive system of the marginal oscillator (2004-1-0408a). Includes: 2 Hurst model CA (3 rpm), 1 Bodine type KYC-22 (1 rpm), 3 Bodine type KYC-22R (6 rpm), and 1 Bodine type KYC-26RM (6 rpm). Some have different sorts of connectors attached, while others have just loose wires. Two (one Hurst and one Bodine) are attached to simple lab-made on/off/reverse controller boxes with standard electrical cords. One Bodine has its three long screws lying loose (the fourth screw is missing).
Signedon Hurst unit: HURST MFG CORP PRINCETON IND. / MODEL CA 115V 60HZ 5W 3RPM
on Bodine units: all have a similar plaque with operating parameters and small circular logo with "BODINE" in front of a motor
on Bodine units: all have a similar plaque with operating parameters and small circular logo with "BODINE" in front of a motor
FunctionThese are all very slow motors (1-6 rpm) that would drive the frequency sweep mechanism for the NMR experiment (2004-1-0408a). Their shaft might would be connected to a variable capacitor mounted on an axis such that its capacitance would increase and diminish periodically with the frequency of the motor. They could also be connected first to a set of pulleys or gearboxes (2008-1-0408g) to change the rotational speed provided to the capacitor.
ProvenanceUsed in Harvard's advanced undergraduate physics lab (Physics 191r) before coming to the collection.