| 摘要 |
<p>Guide apparatus includes an elongate ruler (2) with a straight edge (4) connected by way of hinge means (8) to a calculator apparatus (50). The guide apparatus enables the straight edge (4) to be moved horizontally down a page of vertical columns of figures simultaneously with the calculator apparatus (50). A calculator supported by or incorporated in the calculator apparatus (50) is positioned so that its display and the straight edge are within a single visual field of a user to facilitate the performance of arithmetic operations. The calculator apparatus (50) may support a calculator, or may constitute the calculator. In an embodiment, the calculator housing (50) and the ruler (2) have bores (56, 58) for the receipt of ends of a cranked rod (60) forming the hinge means (8).</p> |
