Carl Linnaeus, The Lapland Journey, translated by Peter Graves (Edinburgh: Lockharton Press, 1995), p. 160.
Jokkmokk [2], 26/07/1732, ¶873:
When they want to cover in the “ackja”, they use a partial cover if a person is going to travel in it and a full cover if they are transporting goods. The cover is of sealskin or cloth mounted over 2 or 3 semi-circular frames that are fitted internally between the bows and a point 2 feet short of the stem. If a person is travelling, the back flap of the cover is tied to him like an apron so that the snow cannot get in. There are also cords fixed to the sides of the “ackja” to secure the traveller and prevent him falling out for, when the vehicle tilts over to the side, the passenger very often has to rely on his elbows.