Slide rule to facilitate fault diagnosis in beer dispensing - has inner rule with inscriptions relating to fault and top cover giving details of possible breakdown reason

摘要

Installation for the drawing of beer underpressure in public houses, bars or restaurants are serviced to ensure quality is maintained. A rule sliding behind windows in a cover both carry descriptions of fault conditions and causes thereby permitting rapid repair. A cover (1) for a slide rule (2) has a series of small windows (3) down one end with a large window (4) above them. The rule carries a number of inscriptions (5) on an upper edge which appear in the large window in the cover. These give details of breakdown conditions. Beneath these are a number of signs (6) which appear in the small windows. Alongside these windows are written the possible causes of the fault. An area (10) on the cover may be used for publicity information.