| 摘要 |
<p>The comprehensive pocket calendar includes a decimeter rule, a protractor, a compass, a letter balance and a letter opener. The protractor comprises marking around the edges of the calender. The compass comprises holes which can be associated with the graduations on the decimeter rule, one hole enabling a pencil or a pin to be inserted so as to form an axis and another hole enabling a second pencil to be inserted so as to draw a circle. By inserting two pins in these holes, one acting as an axis and the other as a support for a letter, it is possible to weigh the letter. A notch is provided in a suitable location and this forms a paper knife for opening letters when used in conjunction with an axis of the calendar. The whole calendar is made of plastic card and occupies an area of typically 80 X 110 mm.</p> |
