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).
Description and fitting instructions for a heated glass 'Mistproof Plate' for vehicle windscreens.
| Identifier | ExFiles\Box 23\3\ Scan080 | |
| Date | 1st February 1922 guessed | |
| Description. THE MISTPROOF PLATE consists of a piece of polished plate glass 15½ inches long, this dimension being standard, the edges being bevelled and polished. All Plates are made the standard length 15½ inches, plates can be supplied 5½, 5, or 4½ inches deep, as desired. To this Plate the bars A, A, B, and C are cemented with transparent cement. Two holes are drilled at E and E for attachment to car screen, and two holes at H and H for electrical terminals. The bar D is made free to move by the action of the expansion springs G and G in order to keep the wires taught under working conditions. Plates can be supplied for any voltage, the resistance wires F being designed to give the necessary heat. The leads from the car lighting batteries are connected to the terminals H and H.{Arthur M. Hanbury - Head Complaints} The Plate thus forms a self contained unit and can be fitted to windscreens of Motor Cars, 'Buses, Lorries, Trams, Aeroplanes, etc. Attachment. WE are prepared to fit plates to customers' screens at the inclusive cost of £3 15s. 0d. When sending screens to us the centre of the drivers line of view should be marked with a cross in chalk on the inside of the screen. The voltage of the car lighting set must be given. We shall be pleased to give full information and instructions to firms undertaking to fit Mistproof Plates themselves. When connecting to the batteries we recommend the inclusion in the circuit of a simple two way switch controlling both engine and plate, ensuring that the plate is switched-off when the engine is not in use, this is in addition to the switch controlling the plate. The MISTPROOF PLATE can be fitted to any Screen in 2 hours. | ||