Patent:US4006344

Binärer Kugelrechner. "A mechanical apparatus for adding or subtracting binary numbers, in a visual manner, comprises a front plate with first and second rows of ball receiving apertures formed near the plate top. Balls are introduced into these apertures in a manner representing binary ones of the numbers to be added. Near the bottom of the front plate is formed a third row of apertures. A back plate having front plate guides is provided against which the front plate is held. Three rows of recesses formed in the front plate contacting face of the back plate and two additional rows of front plate apertures cooperate, when the plates are held nearly vertically and the front plate is slid upwardly along the back plate, to cause movement of balls from the first two rows of front plate apertures, through the recesses and other apertures and without other moving elements or switches and into the third row of front plate apertures in a manner to indicate in the third row the binary sum of the two binary numbers being added. Provision is also made for subtracting a smaller binary number from a larger, balls representing the larger number being introduced into the first row of apertures, other balls representing the compliment of the smaller number being introduced into the second row of front plate apertures and one additional ball being introduced into a specially positioned "minus" aperture in the second row. Upon operation of the apparatus in the same manner as for adding, the binary difference of the two numbers is obtained in the third row of front plate apertures." (aus der Patentschrift)

1 Siehe auch

Digicomp II

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