| 摘要 |
<p>A map distance calculator (40) comprises a linear scale (42) that can be used to measure a specified distance on a map such as, for example, a scaled map of a golf course. The map distance calculator (40) includes a double logarithmic scale (44) that can be moved relative to the linear scale (42) to easily calibrate the calculator (40) to a scaled map. The linear scale (42) is printed on a substantially planar base member in the form of a rectangular sleeve (member 46). A first part (48) of the double logarithmic scale (44) is printed on a sliding member (50) that is slidably coupled to the sleeve member (46). The sleeve member (46) is formed with an elongate window (52) in its upper face extending adjacent to and parallel with the linear scale (42). A second part (54) of the double logarithmic scale (44) is printed along an edge of the window (52). The map distance calculator (40) can be used on a map with a unique scale and subsequently used to directly read off the actual distance.</p> |
