Abstract: The installation for determining the thermal resistance of a wall comprises a first measuring unit applicable to the inner side, respectively the warm side of the building element, the unit comprising a measuring plate made of heat conducting material having a given thermal resistance of which one face is intended to be applied to the building element and of which the other face is in thermal contact with an adjustable plane heating body. The measuring plate provides by means of thermocouples arranged on either face a reference signal corresponding to the heat flow through the measuring plate to an electronic control and calculating unit. Furthermore a second measuring unit arranged on the outer side or cold side of the building element comprises at least one contact plate made of heat conductor material covering the measured area and connected to the control and circulation unit by at least another thermocouple.

Abstract: There is disclosed a process for the production of unsymmetrical, substituted diarylamines by the reaction of a primary aromatic amine and a substituted phenol wherein the phenol is held in excess of the primary aromatic amine thereby minimizing by-product formation as a result of self-condensation of the primary arylamine. The desired secondary amine is produced in high yield and purity by recycling the unreacted phenol.

Abstract: There is disclosed a process for the direct iodination of polyarylidene compounds to provide highly pure para-substituted diiodo derivatives. The polyarylidene compound is reacted with iodine in the presence of an oxidant, unreactive with the aromatic nucleus, in a reaction medium containing a solvent for the polyarylidene compound, a catalyst and water. The reaction medium is recovered for reuse in subsequent reactions by the removal of spent oxidant which, in the preferred embodiment, is based upon the temperature dependent differences in solubility between the diiodo derivative and the spent oxidant.