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    • 5. 发明授权
    • Elementary circular slide rule
    • 元素圆形滑动规则
    • US3747846A
    • 1973-07-24
    • US3747846D
    • 1971-07-08
    • LONG W
    • LONG W
    • G06G1/10G06G1/14G09B19/02G06G1/08
    • G09B19/02G06G1/10G06G1/14
    • This invention relates to a circular slide rule which is particularly adapted for facilitating the learning process of addition and/or subtraction by primary grade students. The slide rule includes a bottom disc, a top disc, and a problem indicator, all coaxially mounted for relative rotation. The problem indicator, in a preferred embodiment, defines a window which is adapted to display only a single number from a scale on the bottom disc and a single number from the scale on the top disc. The algebraic sum of the two numbers displayed in the window of the indicator is read off on one of the scales as being the number opposite to an answer mark on the other scale.
    • 本发明涉及一种圆形滑动规则,其特别适用于促进小学生的加和减的学习过程。 滑动规则包括底盘,顶盘和问题指示器,全部同轴安装用于相对旋转。 在优选实施例中,问题指示器定义了适于仅从底盘上的刻度显示单个数字的窗口,以及来自顶部盘上的刻度的单个数字。 指示器窗口中显示的两个数字的代数和在其中一个刻度上读取为与其他刻度上的答案相反的数字。