Why gold pan riffles increase in length down the table

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why these riffles are made ?and These riffles increased in length incrementally from the top of the table down to the bottom.why these are made in this way? what's the advantage of making in this particular way?why this table constantly shakes?
table-post-2.jpg
 
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jedishrfu said:
Here's an article on the table

http://www.coppercountryexplorer.com/2007/09/mill-machines-the-wilfley-table/

I think the riffles are there to separate out different weights of tailings as the lighter weight stuff would move more with the shaking than the heavier stuff.
I am still confused (even after reading the link you gave )can you please clear all my questions/doubts given in my first post.
 
This quote from the article sums up its operation:
The Wilfley Table is simply a large wooden table, on top of which are a series of parallel “riffles”. These riffles increased in length incrementally from the top of the table down to the bottom. The entire table is set at an angle, and the slime is poured onto it from the top corner. The heavier particles (copper) would be held up along the riffles, while the lighter particles (the non-copper) would roll over them. The whole table is oscillated back and forth over 200 times a minute, which works the copper particles down the riffles and towards the opposite end of the table. From there they are removed. The rest of the slime simply floors off the table at the opposite end and is carried away in a waste launder.
 
jedishrfu said:
This quote from the article sums up its operation:
I didn't understand the following point:
The heavier particles (copper) would be held up along the riffles, while the lighter particles (the non-copper) would roll over them.can you please explain .
 
Simple physics, lighter particles bounce higher and travel further.