The Use of Ropes And Tackle
The Use of Ropes And Tackle
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The gun tackle B is the same as gun tackle A except that its application is different, giving a theoretical advantage of 3 : 1.
Fig. 99. Whip-on-whip multiplies the mechanical advantage by two, where applied as shown. If inverted and the top block applied to the load with the loop snubbed the mechanical advantage would be 4 : 1. In both cases two single blocks are used.
Fig. 100. The Luff tackle has many applications aside from the one shown. Ordinarily consisting of one single and one double b...lock and a single rope, it gives a theoretical mechanical advantage of 4 : 1 in the case shown.
46 Fig. 101. The Port tackle, consisting of Single Whip and a Luff tackle may be applied when the level of operations changes from time to time and it is undesirable to apply the amount of rope necessary to make the Luff part of the set long enough to serve for all levels. A bale sling is also shown in use.
Fig. 102. A Double Luff tackle has a four part line instead of a three part line as in the Single Luff.
What to read after The Use of Ropes And Tackle?
You can find similar books in the "Read Also" column, or choose other free books by Homer J Homer Jackson Dana to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The gun tackle B is the same as gun tackle A except that its application is different, giving a theoretical advantage of 3 : 1.
Fig. 99. Whip-on-whip multiplies the mechanical advantage by two, where applied as shown. If inverted and the top block applied to the load with the loop snubbed the mechanical advantage would be 4 : 1. In both cases two single blocks are used.
Fig. 100. The Luff tackle has many applications aside from the one shown. Ordinarily consisting of one single and one double b...lock and a single rope, it gives a theoretical mechanical advantage of 4 : 1 in the case shown.
46 Fig. 101. The Port tackle, consisting of Single Whip and a Luff tackle may be applied when the level of operations changes from time to time and it is undesirable to apply the amount of rope necessary to make the Luff part of the set long enough to serve for all levels. A bale sling is also shown in use.
Fig. 102. A Double Luff tackle has a four part line instead of a three part line as in the Single Luff.
What to read after The Use of Ropes And Tackle?
You can find similar books in the "Read Also" column, or choose other free books by Homer J Homer Jackson Dana to read onlineMoreLess
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