Abstract: Drive apparatus (2) for a cycle (4), comprising an electric motor (6), a first pulley (8) driven by electric motor (6), a second pulley (10), an endless belt (12) which passes around two pulleys (8, 10) and is driven by first pulley (8), and a swinging link mounting (14). During use, endless belt (12) is in driving engagement with a tire (16) of a wheel (18). Mounting (14) enables the distance between centers of first and second pulleys (8, 10) and tire (16) to vary during use of drive apparatus (2), which enables drive apparatus (2) to exert on tire (16) a varying contact pressure which increases as transmitted torque increases. Mounting (14) comprises an attachment for attaching drive apparatus (2) to cycle (4), and a pivot (24).

Abstract: Drive apparatus (2) for a cycle (4), which drive apparatus (2) comprises a frame (6), a motor (8), a first pulley (10) which is driven by the motor (8), a second pulley (12), and an endless belt (14) which passes around the two pulleys (10, 12) and which is driven by the first pulley (10), the drive apparatus (2) being such that during use the belt (14) as in driving engagement with a tire (16) of a wheel (18) of the cycle (4), and the drive apparatus (2) being such that during use the first pulley (10) does not engage the tire (16).

Abstract: A line scanning circuit for an electrostatically deflected cathode ray tube uses two integrator circuits having single transistor amplifiers for complementary conductivity types with capacitive feedback to provide balanced sawtooth drive waveforms. The charges on the capacitors are reset by pulses at line frequency and the forward sweeps of the sawteeth are produced by current flowing from the input of one integrator to the input of the other integrator. A variable resistor in the current path provides width control and a transistor connected in series with the current path enables dynamic adjustment of the scan to be provided to suit the scanning characteristics of a flat cathode ray tube. A signal from the field scanning circuit during flyback is applied to turn off the transistor in the current path so that the spot is returned during field flyback up one side of the screen.

Abstract: An amplifier for use in the I.F. stages of an F.M. radio receiver comprises several identical direct-coupled stages 2,4,6 each comprising common emitter transistors 8 and inductive loads 10.

Abstract: Printing apparatus for use with electrosensitive paper includes a scanning means in the form of an endless belt 11 suspended between pulleys 13, 14 and carrying writing styli 17. The styli are scanned across the paper 15 as the belt rotates and writing signals are applied from a control circuit 24 via a conductor strip 19 to the stylus which is in contact with the paper. Stylus guiding surfaces 20, 21 are provided to keep the stylus running along a straight edge, and position signals are generated by a transducer 27, such as an optical encoder, so as to synchronize the writing signals.