There are 3 Workers needed to operate the Smithy.

1------
1Match+10Dry Twigs=1Fire1 min
1Iron Ore+3Fire=1Iron3 min
2------
1Iron+5Fire=1Wire30 min
1Wire+5Fire=1Nails45 min
3------
3Wire+1Cable=1Chains1 h
3Iron+1Nails=1Saw45 mins