Education and demonstration – Mathematics – Arithmetic
Patent
1984-10-11
1985-12-24
Grieb, William H.
Education and demonstration
Mathematics
Arithmetic
434207, G09B 1902
Patent
active
045603545
ABSTRACT:
A math teaching device comprising an elongate frame utilizing edge guides disposed along each of its long edges, and a plurality of closely similar counting pieces slidably mounted in an upper portion of the frame. The counting pieces are independently movable, and retained in an operative relationship to each other and to the frame by means of the edge guides. The frame has a recessed lower portion configured to receive an elongate display member, with the display member residing in the frame at a location below the counting pieces. The display member has indicia thereon, with such indicia being placed at a spacing that is consonant with the number and size of the counting pieces utilized. The display member may either be a fixed, integral portion of the elongate frame, or in the form of a slider, such that it can be readily removed, and replaced by another display member containing different indicia. I prefer for the counting-piece-receiving portion of the elongate frame to be of a length corresponding to eleven counting pieces, such that a single indicia space in any of eleven possible locations can be viewed by appropriate positioning of the counting pieces. The preferable indicia for the display member are the numerals zero through nine, with the space at the right hand end of the display member being blank.
REFERENCES:
patent: 465811 (1891-12-01), Anderson
patent: 651892 (1900-06-01), Schneider
patent: 2654164 (1953-10-01), Seidenberg
patent: 3453748 (1969-07-01), Miller
patent: 3755924 (1973-09-01), Langieri
Grieb William H.
Renfro Julian C.
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