| 摘要 |
<p>715,853. Towing ships. LOGAN, J. May 13, 1953 [May 13, 1952], No. 12064/52. Class 114 To control tension in a towline, one end of the line is attached to a movable sheave 6 and a purchase line 7 passes from a winch 14, preferably through fixed sheaves 11, 10, to the movable sheave block 6. thence around a sheave block 9 fixed to the deck, back to the sheave block 6 and finally to a deck ring 8 or a second winch. The sheave block 6 has one more sheave than the block 9.</p> |
