Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 43.

Medelpad, 17/05/1732, ¶138:

With much effort and fatigue we managed at last to reach the top of the hill. In times of war with the Russians, the inhabitants used this as a look-out point and every day a couple of them would stay up here since the sea could be seen in the far distance. A great pile of tall timbers stood there, surmounted by a pole with a barrel of tar on top of it. Since the hill was visible throughout the whole wide district and for many a mile around, the beacon could be lighted by the look-out as soon as the enemy arrived and came ashore.