In the last case they consist of any number of hollow cylindrical pillars, vertical or raking, turned and planed at the ends and united by a projection or socket and by flanges and bolts.
Slabs are also manufactured, and, being readily cut, planed, dressed and enamelled, are used for chimney pieces, billiard tables, wall linings, cisterns, paving, tomb-stones, ridge rolls, electrical switch-boards and various other architectural and industrial purposes.
If the conditions are such that a packing or filling piece must be used, the end of one piece is cut to a new and true surface, and the filling piece is planed to fill the space accurately.
They were built from overlapping strips of American pine, planed smooth and covered with glued canvas.
The new town on the right bank is therefore a centre of the timber export trade, this place being the principal port in Norway for the export of pit-props, planed boards, and other varieties of timber.