i have used the oven to make char cloth before... i found that a tin was no good because it was to thick for this, but tinfoil worked a treat, you need 2 or 3 layers to make it work though....
lay your cloth in the tin foil, making sure the foil is big enough to enclose it, and closes up fully around the cloth, 2 times layers, only use 1 or 2 layers of cloth, and lay them flat and keep them that way....
seal up the parcel totally, then pierce a hole in the middle of the tip foil (dont go all the way through though), lay the parcel on the oven shelf about 3/4 of the way up, the oven should be on full power setting......
keep an eye on the parcel if it smokes to much move it down a shelf, if not enough move it up...
your looking for a very slight stream of smoke, not too much, this will take some time to cook depending on your oven cloth type etc etc etc....it will take some hours though, id say adleast 2, maybe more, thats why you lay it flat and thin....
the kitchen will smell of smoke but should not get smoked out if your careful, this is of course not the best way to do it, it takes lots of time and allot more energy too...
the best way is with a gas stove and a sealed tin in the garden, bbq or fire in the woods....
hope this helps some who have no garden or place near them...
take your time and all should be good though.....