Abstract: A torque delivering power tool for tightening threaded joints to a desired final pretension level, has a motor (11), a power transmission (12) with a reduction gearing (13) and an output shaft (14). A first torque transducer (19) associated with the power transmission (12) is exposed to torque magnitudes corresponding to delivered torque magnitudes up to the desired final pretension level, and an external second torque transducer (20) is arranged to be exposed to load magnitudes which correspond to torque output magnitudes up to a snug level only.

Abstract: A furnace for melting and melt-heat retaining of metals has two horizontal interspaced furnace vessels which form a melt chamber and each having a side wall facing the side wall of the other furnace vessel, each side wall having an opening horizontally aligned with the opening of the side wall of the other furnace vessel. A single inductor is positioned between these side walls and is formed by an integral block of ceramic having opposite ends abutting the outside of the side walls. The block has a transverse through-hole and two longitudinal through-holes straddling the transverse through-hole and open to the two furnace vessels so that they intercommunicate. The inductor has a core with an energizing coil and having a leg extending through the transverse hole. When the energizing coil is powered a melt in the two longitudinal through-holes is heated by an induced circuit which extends into and through melts in the two furnace vessels.