| 摘要 |
The transmitter (8) is mounted on a support (1) which can slide up and down a first circular guide (2) to which it is attached by a guidance box (5) contg. rollers or shoes. The foot of this guide is fixed to another guidance box (4) of similar construction which can slide to and fro along a second circular guide (3) between end-pieces with levelling jacks (6). The two guides are orthogonal and their axes are situated at equal distances from a stationary receiver (7) towards which the transmitter always faces throughout the sliding movements. |
