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2. Block and tackle - Wikipedia

   en.wikipedia.org/wiki/Block_and_tackle

   Consider the set of pulleys that form the moving block and the parts of the rope that support this block. If there are n of these parts of the rope supporting the load F B, then a force balance on the moving block shows that the tension in each of the parts of the rope must be F B /n. This means the input force on the rope is F A =F B /n.

3. Pulley - Wikipedia

   en.wikipedia.org/wiki/Pulley

   A sheave or pulley wheel is a pulley using an axle supported by a frame or shell (block) to guide a cable or exert force. A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain.

4. Crane (machine) - Wikipedia

   en.wikipedia.org/wiki/Crane_(machine)

   Cranes are commonly employed in transportation for the loading and unloading of freight, in construction for the movement of materials, and in manufacturing for the assembling of heavy equipment. The first known crane machine was the shaduf , a water-lifting device that was invented in ancient Mesopotamia (modern Iraq) and then appeared in ...

5. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   Because there is a traveling pulley at the load, this doubles the mechanical advantage of the fixed (anchored) sprocket assembly, leading to a total mechanical advantage of 2 × ⁠ P 1 / P 1 − P 2 ⁠. For instance, a 1-ton differential chain fall might have a 15-pocket and a 14-pocket sprocket set.

6. Glossary of nautical terms (A–L) - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_nautical_terms...

   A pulley with one or more sheaves or grooves over which a line is roved. It can be used to change the direction of the line, or in pairs used to form a tackle. [2] block, fiddle A block with two sheaves in the same plane, one being smaller than the other, giving the block a somewhat violin appearance. block, snatch

7. Lewis Burwell Puller Jr. - Wikipedia

   en.wikipedia.org/wiki/Lewis_Burwell_Puller_Jr.

   Lewis Burwell Puller Jr. was the son of Lt. General Lewis "Chesty" Puller, the most decorated Marine in the history of the U.S. Marine Corps. He followed in his father's footsteps and became a Marine officer. Puller graduated from the Christchurch School, in Christchurch, Virginia, in 1963 and from the College of William and Mary in 1967. [2]