Abstract: A method of combining electric heating with a wood-heated masonry furnace is provided. The masonry furnace has an outer jacket (1) and at least one fire chest (5, 6) arranged therewithin for burning the wood. Cheek conduits (8) between the outer surface of the fire chest and the inner surface of the outer jacket, are provided. The conduits are connected to the fire chest (5, 6) at one end and to a flue (9) at the opposite end. At least one electric resistor element (13) is installed inside the furnace. In order that electrical heating could be easily combined with any existing masonry furnace, holes (14) are drilled in the fire cover (10) of the furnace and the at least one resistor element (13) is arranged to hang from the fire cover (10) in the air space (8, 16) inside the furnace.

Abstract: The invention relates to a corner joint for building units of stone, especially of soapstone, for furnaces or the like to join two units (1, 2) cornerwise to each other by using a binding hook (3) extending from one stone unit (1) to another (2), which binding hook is arranged to sink into a groove (4) cut in an edge (14) of the stone units for this purpose, while joint pins (5) of the hook sink into borings (7) provided for them, the joint comprising a corner piece (8) separate from the units (1, 2) and having two joint surfaces (9, 10) forming an angle with respect ot each other, against which surfaces joint surfaces (11) of the units (1, 2) are arranged. To carry out the installation of the corner joint reliably and effectively, at least one end face (12) of the corner piece (8) is provided with a groove (13), into which a web portion (6) combining the joint pins (5) of the binding hook (3) is arranged to sink in order to lock the units (1, 2) and the corner piece (8) together.