Abstract: A solid polymer electrolyte for a solid state electrochemical cell comprises a complex of a solid polymer such as poly(ethene oxide) and an alkali metal salt such as LiClO.sub.4, which polymer is capable of forming donor: acceptor type bonds with alkali metal ions and is capable of conducting alkali metal ions, the complex being associated with a mixture of more than one 1,3-dioxolane-2-ones, for example ethylene carbonate and propylene carbonate, such that the electrolyte possesses satisfactory ambient temperature ionic conductivity (e.g. 10.sup.-3 to 10.sup.-4 ohm.sup.-1 cm.sup.-1) and a cell including the electrolyte substantially maintains its discharge capacity at ambient temperature after repeated charge/discharge cycling.

Abstract: An electrical control device (8) is operable by a lever (12) and includes a deformable member (50) which is deformed in response to manual pressure on the lever. The deformable member (50) has an electrically conductive surface portion (52) which is arranged to engage a continuous area or track of resistive material (62) such that as a changing manual pressure is applied to the lever (12) a changing amount of the track is electrically bridged or short circuited by said conductive surface portions (52). The resistive area or track is connected to electrical terminals (64, 66) so as to present a continuously variable electrical resistance across the terminals depending on the manual pressure applied.

Abstract: According to a method and apparatus for displaying data on a display screen, such as the screen of a digital storage oscilloscope, in a ROLL mode and prior to a trigger event, newly acquired data is continuously newly displayed at a given point on the screen as the oldest displayed data is rolled off the screen at a first side. This is continued even during a REFRESH mode until a trigger event occurs, at which time the displayed data is frozen on the screen and newly acquired data is written across the screen toward a second side of the screen, so that at the time the newly acquired data is written to the second end of the screen, data is observable which represents a certain period before the trigger event and after the trigger event.