spare gearboxes (3) for marginal oscillator
Date: mid 20th-late 20th Century
Inventory Number: 2004-1-0408g
Classification: Nuclear Magnetic Resonance
Subject:
User: Department of Physics, Harvard University (founded 1884)
Maker: American ?
Associate Name: Robert V. Pound (1919 - 2010)
Cultural Region:
City of Use:
Dimensions:
gearboxes: 13 x 18 x 14.5 cm (5 1/8 x 7 1/16 x 5 11/16 in.)
pulleys: 9.2 x 19.3 x 18 cm (3 5/8 x 7 5/8 x 7 1/16 in.)
Accessories: five odd knobs, each with some sort of arrow showing which way it is pointing
Description:
Two identical gearboxes inside cast-iron cases, and one shop-built adjustable pully system.
The cast-iron cases, mounted on wood bases, appear to be put together from three standardized sections, labeled "NL-31704-2" (top), "NL-31846-14A" (front) and "NL-31913-12" (back). Each has five protruding shafts, some of which carry attachments (black plastic knobs, a universal ball joint, a coupler).
The pulley system has three elastic bands and four separate pulley "clusters" (sets of pulleys of various sizes that turn together) made of clear plastic. It has a metal base and sides that look very much like the base and sides of the Rf coil (2004-1-0408b). Inscribed on the ends of the base beneath the pulleys are digits, arranged vertically: one side has 5/4/5 and 2/3/4; the other has 1/3/5. The pulley system has two protruding shafts, one with a coupler attached.
The cast-iron cases, mounted on wood bases, appear to be put together from three standardized sections, labeled "NL-31704-2" (top), "NL-31846-14A" (front) and "NL-31913-12" (back). Each has five protruding shafts, some of which carry attachments (black plastic knobs, a universal ball joint, a coupler).
The pulley system has three elastic bands and four separate pulley "clusters" (sets of pulleys of various sizes that turn together) made of clear plastic. It has a metal base and sides that look very much like the base and sides of the Rf coil (2004-1-0408b). Inscribed on the ends of the base beneath the pulleys are digits, arranged vertically: one side has 5/4/5 and 2/3/4; the other has 1/3/5. The pulley system has two protruding shafts, one with a coupler attached.
Signedunsigned
Inscribedsee description
FunctionUsed as replacement components in the electromechanical drive system for the marginal oscillator (2004-1-0408a), and to change its rotational speed and hence the speed of the frequency sweep of the NMR apparatus.
ProvenanceUsed in Harvard's advanced undergraduate physics lab (Physics 191r) before coming to the collection.
