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).
Sales and technical specification sheet for Cossor Instruments' Model 3353 Maximum Pressure Valve and Model 3350 Contact Breaker.
| Identifier | ExFiles\Box 167\2\ img250 | |
| Date | 12th February 1940 guessed | |
| COSSOR INSTRUMENTS Model 3353 Maximum Pressure Valve. The Cossor-Dodds equipment will not measure the constant component of pressure, and thus is not capable of calibration by static means. A valve has therefore been developed to allow of accurate calibration under actual working conditions. Illustration above shows this Maximum Pressure Valve, which is used to calibrate the diagram, when operated in conjunction with a Bourdon gauge. The device screws into the cylinder or fuel line under test, and consists essentially of a non-return valve which allows pressure peaks to be communicated to a gauge, via a length of expansion tubing, until the pressure at the gauge is equal to the highest pressure reached in the equipment on test. By noting the highest pressure recorded on the screen of the cathode ray tube during this period, the diagram may be scaled for quantitative work. The valve only is supplied, as the user may best select a gauge and tubing suited to his individual conditions of pressure and space. Model 3353 Maximum Pressure Valve — Price £11-11-0 Model 3350 Contact Breaker. Whilst for certain purposes, e.g. the determination of I.H.P. it is desirable to have a deflection along the horizontal axis of the diagram which is a linear function of piston displacement, it is more convenient for general pressure recording to have a base which is linear with respect to time and is therefore representative of crank angle. Such a sweep is provided by the Model 3409 Amplifier and 3408 Sweep Unit, and to be of real utility, it is essential that this sweep be accurately synchronised with the engine. It is to fulfil this need that the Model 3350 Contact Breaker below has been developed. Particular care has been taken in the design, to combine extremely robust construction with consistently reliable operation and a minimum of maintenance over long periods. To this end, standard ignition components have been employed, and the device is capable of reliable operation at speeds in excess of 6,000 r.p.m. Provision is made for continuous adjustment of the phase angle between the drive shaft and the contact breaker through 360°, and a protractor and indicator are provided to allow of accurate angular calibration of the horizontal axis of the diagram. A liberal plain shaft is provided to which the user may affix his own coupling, whilst thirty feet of lead is provided so that the recording may be carried out at a sufficient distance from the engine to ensure freedom from excessive noise or vibration. Model 3350 Contact Breaker — Price £17-6-6 Prices are subject to alteration without notice. We reserve the right to vary specifications if necessary. Telephone: Canonbury 1234 (30 lines). Head Office: A.{Mr Adams} C. COSSOR LTD. INSTRUMENT DEPT. Cossor House, Highbury Grove, London, N.5. Telegrams: Amplifiers, Phone, London Depots at: BIRMINGHAM: 14-16 Carrs Lane (4)............Tel. Midland 5791-2-3 BRISTOL: 14 Bath Street (1).................Tel. Bristol 20271-2 GLASGOW: 21 Waterloo Street (C.2).......Tel. Central 4446-7 LEEDS: Murray's Bld. Neville Street (1)...Tel. Leeds 21581-2 MANCHESTER: 6, 8 & 10 Cannon St.{Capt. P. R. Strong} (3)...Tel. Blackfriars 9777-8-9 NEWCASTLE: 3 St.{Capt. P. R. Strong} Nicholas Bldgs. (1).....Tel. Newcastle 23154-5 BELFAST: 47 Queen Street..................Tel. Belfast 26088 DUBLIN: 185 Pearse Street...................Tel. Dublin 44066 | ||