| 摘要 |
PURPOSE:To enable a highly accurate measurement eliminating errors at stations and measuring points by incorporating a lighting into the staff while using two marked lines. CONSTITUTION:The marked line 1, a fine line, is provided on the surface of a staff for short range measurement and the marked line 2, a heavy line, for long range measurement. A marked line lighting device 3 is provided inside the staff with a power source switch 4 attached at the upper part thereof and an operation switch 5 at the lower part thereof to facilitate the measurement. |
