Discuss the purification methods used in the olden days
in the olden days we used smoke,light reflection and beacons
Discuss the purification methods used in the olden days
Cloth.
on the water.
In the olden days there were no banks so people used to keep their money under their heads
In the olden days it was used for entertainment.
guns and cannons
letters
It all depends on what sense you are speaking of; because in the "olden days," as you say, candles were used in order to provide some light in dark places.
the roads were used for carriges and horses to get transport in the olden days.
wooden and clay tablets