| 摘要 |
PROBLEM TO BE SOLVED: To provide a simply-structured inexpensive oscillation frequency measuring apparatus allowing handy measurement of a natural frequency of a building. SOLUTION: In this oscillation frequency measuring apparatus, a plurality of needles 2, 2, etc., oscillating according to the natural frequency of the building are arranged on a mounting base 1 installed in the building. In the needles 2, 2, etc., the length from their tips to a needle mounting face 3 of the mounting base 1 are varied one another, and an indication 10 is provided in the mounting base 1 so that an oscillation frequency is read from the oscillation state of the needles 2, 2, etc.
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