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).
Product information sheet for Erie Suppressors and Erie Resistors, detailing performance tests, mechanical features, and company details.
| Identifier | ExFiles\Box 168b\1\ img144 | |
| Date | 11th January 1938 guessed | |
| ERIE SUPPRESSORS MECHANICAL FEATURES Resistance Pin Bakelite Shell Contact Spring Ignition Cable Terminal Spark Plug Terminal Figure 4 Graph of % Change Resistance vs{J. Vickers} Distance - Miles Legend: Average Elevated Temperature Load Change Ambient temperature......150° C Load...................3/8" air gap Primary voltage......8 1/2 volts Speed..................50 M.P.H. HUMIDITY To subject Erie Suppressors to conditions more severe than encountered in actual service, the elevated temperature load test has been devised. This subjects the units to an ambient temperature of 150 degs. C., load of 3/8" air gap, primary voltage of 8 1/2 volts and speed of 50 miles per hour. As Figure 4 shows, the drop under these conditions is quite rapid during the first 5,000 miles, after which it is more retarded, reaching a maximum of —10 per cent. at 50,000 miles. It should be borne in mind that in both the normal and elevated temperature load tests no chance is given for any recovery in the suppressors which would take place in actual use when the automobile motor is not running. In these two laboratory tests the suppressors are removed only momentarily for checking their resistance at infrequent intervals. It is estimated that the 50,000 miles at 50 miles per hour used in these tests is equivalent to approximately five years of average driving. Erie Suppressors will maintain their efficiency during the life of any radio set. Although the above tests show results for only 50,000 miles, a group of Erie units have been on test continuously for approximately two years, which is equivalent to 750,000 miles at 50 miles per hour. During this time the average change in resistance value has been only 4-1 per cent. Note.—The charts reproduced on pages 3 and 4 represent average values of several individual results. The change in resistance of Erie Suppressors after 1,000 hours in 100 per cent. humidity at 40 degs. C, is well within usual tolerances specified by radio manufacturers. Erie Suppressors are ruggedly constructed to withstand motor temperatures, vibration, and road shock. There are no soldered contacts in the assembly to open circuit due to engine heat. Every unit is sealed, making it impossible for water, grease or dirt to affect its operation. Erie Suppressors will fit any automobile engine in production to-day. They are also used with equal effectiveness on motor yachts and motor cycles in which there are radio installations. THE COMPANY Erie Suppressors are manufactured by a pioneer resistor company. The Erie Resistor Limited has always devoted its entire interests to producing carbon resistance products for the radio field exclusively. No amount of expense has been spared in equipping its three plants at London, England, Erie, Pa.{Mr Paterson}, and Toronto, Canada, with the finest automatic machinery. Because of the exacting standards to which Erie products are manufactured, much of this production equipment has been designed by Erie engineers. Production is checked by daily laboratory tests and research is being continually carried on to improve Erie Suppressors. The fact that 27 leading automobile manufacturers have approved these units is proof of their satisfactory operation. ERIE RESISTORS This company manufactures a complete line of moulded carbon resistors for use in radio receivers. Made in various wattage ratings, they can be supplied to any desired resistance value from a few ohms to several megohms. Their conservative ratings permit the use of smaller size units, an important factor in auto radios where compactness is essential. Erie Resistors can be counted on to give dependable, balanced performance. In a series of laboratory tests, conducted by Erie engineers, a great lack of uniformity in the characteristics of many makes of resistors was revealed. Standard production Erie units and those of six competitive makes were tested for voltage coefficient, temperature coefficient, and humidity, load and noise characteristics. Although the Erie Resistors did not present the best record in every individual test, they were the only group that were consistently good in the entire series of tests. A bulletin giving full description and technical data on these products may be had on request. 4 | ||