Abstract: A building block wherein two elongated bars are pivotally connected to each other along their longitudinal edges by a first hinge and at least one end portion of each bar is provided with one or more parts of a second hinge which serves to articulately connect the respective end portion to one end portion of a bar forming part of an additional building block. The axes of the first and second hinges are normal to each other. The building blocks can be assembled into skeleton frames forming part of roof structures, erector sets, decorative arrangements, kiosks and/or other combinations of modules.

Abstract: An apparatus for electrodepositing a layer of predetermined layer thickness has an anode supplied with DC voltage by a converter device. A programmable computer having inputs for the desired value of the layer thickness and for technological parameters, such as anode index and area factor, cyclically sums the current charge as the integral of current from digitized sampling values of the anodes current and determines therefrom the actual value of the layer thickness. When the desired thickness value is reached, the converter device is disconnected.