Description | View of open trench with mains and valves; legend "Linacre Works Shows the 27in connection between the outlet of boosters and a 27in Tee at low level to supply gas: (a) southwards (upwards in the photograph) to the Messenger Main; or (b) northwards (downwards in the photograph) on to the principal IHP main now being known as the 'West Derby Main'"; Ref M138; dated 19 December 1946 |