Weighing scales – Weigher responsive material control – With external intercontrol
Patent
1977-01-17
1978-08-15
Grieb, William H.
Weighing scales
Weigher responsive material control
With external intercontrol
177190, G09B 1902
Patent
active
041062205
ABSTRACT:
A balance beam teaching aid illustrates and verifies mathematical operations involving both integer and non-integer numbers. The balance beam includes a base, a balance arm having a center of gravity and graduations disposed on a face at predetermined longitudinally spaced intervals and a suspension system for pivotably suspending the balance arm from the base to permit rotation of the balance arm in the vertical plane and for preventing rotation of the balance arm in the horizontal plane. Substantially two dimensional area-weights formed from a uniform density, uniform thickness material are attached to the balance arm by inserting the area-weights into a pressure-closed slot disposed in a face of the balance arm and extending along the entire length thereof. The area-weights are typically cut from sections of relatively heavy paper which has a rectangular grid imprinted thereon.
REFERENCES:
patent: 591202 (1897-10-01), Witzel
patent: 849418 (1907-04-01), Nickerson
patent: 1404426 (1922-01-01), Becker
patent: 1415278 (1922-05-01), Tod
patent: 2074384 (1937-03-01), Gattoni
patent: 2672754 (1954-03-01), Kent
patent: 2955811 (1960-10-01), Jonas et al.
patent: 3188089 (1965-06-01), Odell et al.
patent: 3204344 (1965-09-01), McMeen
patent: 3212202 (1965-10-01), Heinichen
patent: 3224521 (1965-12-01), Czanderna
patent: 3339291 (1967-09-01), Ruchlis
patent: 3486244 (1969-12-01), Horn
patent: 3567221 (1971-03-01), Stults
patent: 3928923 (1975-12-01), Harte
patent: 3949491 (1976-04-01), Harte
Gas Chromatograpny: Academic Press Inc., 1958, Title Page, pp. 96 and 117.
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