sentences:  By now, living at various addresses in Peckham and East Dulwich, in the London Borough of Southwark and running Chepstow Motors, a Peckham Road motorcycle shop with a Velocette agency, Turner conceived the Square Four engine in 1928.At this time he was looking for work, showing drawings of his engine design to motorcycle manufacturers.The engine was essentially a pair of 'across frame' OHC parallel twins joined by their geared central flywheels, with a one-piece four-cylinder block (or Monobloc) and single head.