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Gyration Cell
Source
This building becomes available after you have learned the Metallurgy 3 tech.
Cost
 1000 Boards
 500 Clay
 250 Concrete
 50 Copper Sheeting
 12 Crucibles
 20 Glass Pipe
 100 Leather
 50 Moon Steel
 10 Pulley
 25 Tin Sheeting
Built in a Compound. Uses 7x7 cells.
Use
 Smelt Copper Ore to produce Copper
 Smelt Iron Ore to produce Iron
 Smelt Tin Ore to produce Tin
 Smelt Lead Ore to produce Lead
Uses up to 50 Charcoal for fuel.
After firing, the metal will be ready in 15 minutes (if fully loaded with Charcoal) and will stay in the furnace until removed.
Operation
A Gyration Cell holds up to 1500 ore and 50 Charcoal.
1500 ore, 50 Charcoal for 15 minutes yields 150 metal.
750 ore, 50 Charcoal for 15 minutes yields 75 metal.
In general, X ore, 50 Charcoal for 15 minutes yields X/10 metal.
Be careful : if you open the gyration cell while functioning, all the ore and charcoal will be wasted, only the metal already produced will remain.
Yield
Ore Used  CC Used  Metal Yield  Time opened  Ore Cost/Metal 

1500  50  150  15 mins  10 
100  50  10  15 mins  10 
1000  50  100  15 mins  10 
 Conjecture: 1500/150=10 implies that 10 ore cooked for 15 minutes will yield 1 metal. But this is without rounding. With rounding, you get 5 ore yields 1 metal, 15 ore yields 2, n*105 ore yields n metal, etc. in 15 minutes. Of course, with the cooking cost being 50 CC, extra efficiency comes at a high cost in the renewable charcoal.
 Rounds Up: Always load in numbers ending in 0 or 5. If you are loading the max of 1500, then load 1495 instead. It will still yield 150 iron. Load 95 (instead of 100) and you will get 10 iron. Never load with numbers ending with 14 else it still rounds down and you wasted your extra 14 ore. Loading a number ending with 69 will also waste ore.  Cegaiel
Optimal Yield Chart:
Ore Used  CC Used  Metal Yield  Time opened  Ore Cost/Metal 

1495  50  150  15 mins  10 
95  50  10  15 mins  10 
995  50  100  15 mins  10 
You don't need to load the exact ore amounts in charts above, just remember its 10% metal of the amount of ore you load. You still always use 50cc. Again, always load in a number ending with 5 for optimal yield.
