Higher diamondoid derivatives capable of taking part in polymerization reactions are disclosed as well as intermediates to these derivatives, polymers formed from these derivatives and methods for preparing the polymers. The reduction reaction is carried out in low boiling point monoalkylethers of ethylene glycol and mixtures of this solvent with alkane diols. The output signal from the phase shifter is amplified and input to the drive for exciting the resonating mass, to thereby form a closed resonance loop for controlling the oscillation amplitude of the resonating mass. Digital signals thus stored in the image memories are respectively amplified by white balance gain circuits with different gains.