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Cogs & Pulleys (Cog Confusion in the UK version) is a puzzle in Professor Layton and the Last Specter.

Puzzle

US Version

You find a large machine in a warehouse. It looks like it could be some kind of complicated device for moving a bucket up and down, but all the cogs and wheels make it difficult to know which way to turn the handle.

Can you work out which way the bucket will move if you turn the handle clockwise? Touch the arrow that points in the correct direction. All of the cogs and pulleys are in good working order.

UK Version

You find a large crane in the warehouse. It looks like it could be some kind of complicated device for moving a bucket up and down, but all the cogs and wheels make it difficult to know which way to turn the handle.

Can you work out which way the bucket will move if you turn the handle clockwise? Touch the arrow that points in the correct direction. All the cogs and pulleys are in good working order.

Hints




Click a Tab to reveal the Hint.

US Version

Think about the direction that each cog will move, starting from the one connected to the crank.

The direction that each cog moves will change depending on cogs, pulleys, and ropes connected to it.

UK Version

Think about the direction that the cogs will turn one at a time. For each one, consider the other cogs and the pulleys that are connected to work out which way it rotates.

US Version

When two cogs connect, the second one will move in the chain. The pulleys will change the direction in which the rope moves.

When a pulley is connected to a cog or another pulley, the direction will be reversed if the rope is crossed and stay the same if it doesn't cross.

UK Version

When two cogs are connected they will always rotate in opposite directions. In a pulley system, though, the direction that connected cogs and wheels rotate depends on the rope that connects them - the direction will be reversed if the rope is crossed and stay the same if it isn't.

US Version

The first cog with the crank handle attached to it turns clockwise. The rope connected to it doesn't cross, so the cog connected to the rope will also turn clockwise.

The next connection is between two cogs, so the direction will reverse to counterclockwise. Keep moving through the chain of cogs, pulleys, and ropes in this manner.

UK Version

Let's start with the first few components.
If you turn the wheel attached to the handle clockwise, the cog connected to it by an uncrossed rope will also turn clockwise. The next component along is a directly connected cog, which will turn in the opposite direction, or in other words, anticlockwise.

Continue working along like this until you get your answer.

US Version

The final cog will move clockwise.

So will the bucket go up or down?

UK Version

If you work your way through the components, you'll find that the final cog moves clockwise.

If that's so, will the bucket move up or down?


Solution

Incorrect

US Version

Too bad!

At least there's only one other option...

UK Version

Too bad.

There's only one choice remaining.

Correct

US Version

Correct!

The bucket will move upward.

What a complicated mechanism for moving one lousy bucket, eh?

UK Version

Nice move!

The bucket will move upwards.

A pretty complicated mechanism for hoisting a single bucket, eh?

LS103S

A big thanks to http://professorlayton4walkthrough.blogspot.com

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