| 摘要 |
PURPOSE:To measure a swimming speed easily, rapidly and securely by a swimmer himself or herself, by using a start switch board incorporated power source switch and radio transmitter plus a time board consisting of a digital timepiece and relational members. CONSTITUTION:Switch board 2 incorporated radio transmitter 6 and ready switch is provided on start base 1 and once a swimmer starts, electric power is supplied to the switch board 2. On the other hand, time board 4 provided on the surface, etc., of the counter wall to start base 1 consists of switch 9, a radio receiver, large- sized digital timepiece 7, plural small-sized digital timepieces 8..., etc., and waterproofed completely. Every time the swimmer touches switch 9, the display of timepiece 7 is shifted to timepieces 8 one after another and timepiece 7 is reset, so that the swimmer can measure his or her speed rapidly, securely and easily alone without the help of another person. |
