From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Service bulletin for the AC Petrol Gauge with a geared type tank unit.
| Identifier | ExFiles\Box 61\3\ scan0276 | |
| Date | 18th September 1931 | |
| AC SPHINX SPARKING PLUG Co., LTD. BULLETIN GAUGE-106 BIRMINGHAM Date: 18-9-31 Sheet 1 AC SPHINX SERVICE BULLETIN No. of Sheets 3 SUBJECT--AC PETROL GAUGE (With GEARED TYPE TANK UNIT) DESCRIPTION The AC Petrol Gauge is of the electric type and is composed of two units : 1. The Dash Unit, mounted on the instrument board, consists of two coils spaced at 90° and wound so that they will have like polarity in the faces exposed to the armature which is integral with the pointer. The face or dial has a scale graduated in degrees betwween "Empty" and "Full." 2. The Tank Unit, assembled in the petrol tank, consists of a housing enclosing a rheostat or resistance unit with a moving arm which is actuated through a pair of gears by a float arm assembly immersed in the fuel of the tank. All steel parts of the Tank Unit are Cadmium plated, the rheostat or resistance coil is Chromel wire wound on a Celeron core and the remaining parts are brass, thus making the entire assembly completely corrosion proof. IGNITION SWITCH BATTERY GROUND EMPTY FULL PETROL DASH UNIT INTERNAL RESISTANCE INCORPORATED INSIDE 12 VOLT DASH UNIT ONLY TANK UNIT GROUND FLOAT | ||