| 摘要 |
PCT No. PCT/GB90/00831 Sec. 371 Date Dec. 2, 1991 Sec. 102(e) Date Dec. 2, 1991 PCT Filed May 29, 1990 PCT Pub. No. WO90/14928 PCT Pub. Date Dec. 13, 1990.An angle finding device particularly in the form of a hammer having a circular or part circular spirit level vial (8) provided with a graduated scale mounted in the hammer head (3). A straight spirit level vial (10, 11) may be positioned across a diameter of the circular vial (8) such that its axis lies at an angle alpha to the axis (A) of the shaft. This combination enables the hammer to be used as an angle finding device and a general levelling device when the striking face (6) of the hammer and the end (5) of the shaft are placed against a work surface (W) to be level tested.
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