Educational training device

Claim 2

An educational device for use as an aid in converting a numeral from one base numeration system to a numeral in another base numeration system comprising: A frame having a front wall provided with a plurality of horizontally extending rows of windows; an elongated cylinder mounted on said frame behind said front wall; a plurality of circumferentially spaced, longitudinally extending rows of indicia provided on the periphery of said cylinder; each row of indicia representing equivalent place values of exponential notations of a desired base numeration system; means for rotating said cylinder to expose a selected row of said place values through one of said rows of windows; means mounted on said frame In vertically spaced relation to said cylinder for displaying numerals through a second row of windows in said front wall, and mathematical symbols imprinted on the outer face of said frame front wall for indicating the mathematical procedure to be followed to facilitate computation of said place values and said numerals in the process of converting a numeral from one base numeration system to an equivalent numeral in another base numeration system.

Claim 3

An educational device according to claim 1 wherein said numeral displaying means comprises a fixed shaft rigidly secured on said frame behind said front wall in substantial parallelism with said cylinder; a plurality of relatively short, rotatable cylinders mounted on said shaft in general registry with the windows in said second row of windows; circumferentially spaced, numerical digits provided on each of said short cylinders; each of said short cylinders being rotatable to expose a selected digit through an associated window in said second row of windows.

Claim 4

An educational device according to claim 2 including a second elongated cylinder mounted on said frame behind said front wall in substantial parallelism with said first mentioned cylinder; a plurality of circumferentially spaced, longitudinally extending rows of indicia provided on the periphery of said second cylinder; each row of indicia on said second cylinder representing a series of exponential notations of a predetermined base numeration system; and means for rotating said second cylinder to expose a selected row of said exponential notations through a third row of windows in said front wall.

Claim 5

An educational device according to claim 3 wherein said means for rotating said elongated cylinders comprise manually operable knobs adjacent at least one end of each of said elongated cylinders.

Claim 6

An educational device according to claim 1 wherein said frame includes a rear wall, a top wall, a pair of side walls and an open bottom end; said front wall being removably secured to said frame to provide access into the interior of said frame.

Claim 7

An educational device according to claim 2 including means for maintaining said short cylinders in properly spaced position longitudinally of said fixed shaft and in registry with their associated windows in said second row of windows.

Claim 8

An educational device according to claim 6 wherein said maintaining means comprises a pair of elastic rings encircling said fixed shaft on opposite sides of each of said short cylinders.

Claim 9

An educational device according to claim 1 wherein said numeral displaying means comprises a fixed shaft rigidly secured on said frame behind said front wall in substantial parallelism with said cylinder and spaced thereabove; a plurality of relatively short, individually rotatable cylinders mounted on said fixed shaft in general registry with the windows in said second row of windows; circumferentially spaced, numerical digits provided on each of said short cylinders; said short cylinders being rotatable to expose selected digits through said second row of windows to form a numeral; a second elongated cylinder mounted on said frame behind said front wall in substantial parallelism with said first mentioned cylinder and spaced above said fixed shaft; a plurality of circumferentially spaced, longitudinally extending rows of indicia provided on the periphery of said second cylinder; each row of indicia on said second cylinder representing a series of exponential notations of a desired base numeration system; means for rotating said second cylinder to expose a selected row of said exponential notations through a third row of windows in said front wall; the windows in each of said horizontally extending rows of windows being in vertical alignment with windows in the other rows of windows; and means for maintaining said short cylinders in properly longitudinally spaced relation on said fixed shaft and in registry with their associated windows in said second row of windows.

Claim 10

An educational devIce according to claim 8 wherein said indicia and said digits are imprinted on strips of material adhesively secured to the peripheral surfaces of said cylinders, respectively.