| 摘要 |
<p>A linear measurement apparatus is in the form of a highly portable and manipulable hand-held pen which can be linked by an interface to a computer running a spreadsheet program. The pen comprises a sensing tip in the form of a ball (4), at one end of a rotary shaft (5), running along the axis of the pen. The shaft (5) may be driven in rotation, its rotation being detected by a sensor (11, 12, 13) which can provide a count indicative of the amount of rotation of the ball (4) and thus of the length of a line the ball (4) traverses. The line length can be entered in the spreadsheet.</p> |
