ClipArt ETC
"When a high degree of force is required, several moveable pulleys may be combined, as represented [here]. A and B are fixed pulleys; C and D are moveable ones, from the block of which the weight W is suspended" —Quackenbos 1859

Multiple Pulleys

"When a high degree of force is required, several moveable pulleys may be combined, as represented [here].…

"Features six movable pulleys aligned on the same axis. This pulley was invented to reduce the friction of each block to a single wheel." —Quackenbos 1859

White's Pulley

"Features six movable pulleys aligned on the same axis. This pulley was invented to reduce the friction…