Abstract: A winder preferably for winding separate metal strips into coils following slitting a wider strip, comprises a power-operated mandrel and pyramidal sleeves successively mounted on this same mandrel for axial movement. On the pyramidal sleeves, mounted for longitudinal movement thereon are segmental members forming a drum section on each pyramidal sleeve for winding a separate strip. The drum sections are interconnected by split rings having a generally U-shaped cross section and mounted on the power-operated mandrel and between adjacent drum sections are drive rings frictionally engaging the end surfaces of the pyramidal sleeves, whereby axial movement of pyramidal sleeves actuated by a mechanism for imparting such movement thereto brings about setting of the apparatus from a retracted to expanded position and vice versa.

Abstract: A speed governor for a hydroelectric unit includes an error sensing means, an integrator and a gate opening control means connected to the output of the integrator for controlling the degree of opening of the turbine gate apparatus. The governor further comprises a limiter connected between the output of the error sensing means and the input of the integrator for limiting the maximum value of the integrator input signal to a limit value equal to the minimum integrator input signal value which insures the maximum permissible rate of change of the degree of opening of the gate apparatus.

Abstract: A current-conducting film for electric resistance heaters, consisting of tin dioxide, antimony and boron which are used in the following ratios in percent by weight: tin dioxide 78.0-96.8; antimony, 3.0-20.0 boron, 0.2-2.0. The current conducting film exhibits high thermal stability (up to 900.degree. C. in air), critical specific input of 60 W/cm.sup.2 with strong adhesion to a support and good reproducibility of electrical parameters and physical properties.