Abstract: A method for reinforcing materials already in place in the ground using fibrous additives.

Abstract: A material intended to form grounds, layers or sublayers of terrains or of carriageways.It contains an ungraded granulated material such as sand or pulverulent materials of industrial origin to which bundles of glass filaments are added in a proportion from 0.01 to 0.1%.

Abstract: The invention relates to a glass microfibre based paper, the said fibres being obtained by centrifugal processing of molten glass which is drawn by an annular gas flow at elevated temperature and velocity, which passes along the peripheral wall of the centrifuge. The centrifuge rotates at a peripheral velocity of between 50 and 20 m/sec. and the quantity of glass drawn is less than 6 tons per day and per meter of centrifuge periphery in the case of microfibres of 2 to 3 microns and less than 1 ton per day and per meter of centrifuge periphery in the case of microfibres of less than 1 micron.

Abstract: Twelve flip-flops each corresponding to one of the twelve keys within an octave are provided. Each is set by depression of one corresponding key in the accompaniment manual or simultaneous depression of more than one key in the manual for playing the melody. All flip-flops are reset upon depression of a subsequent key. The q output of each flip-flop is connected to a corresponding input of reduction circuits which reduce all possible combinations of the input signals to 32 five bit words signifying 31 chords and an O signal. The 32 words are applied to tone control means which also receives signals from a bass program selector. The tone control means produces rhythmically the codes of the appropriate bass tones.