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).
Care and maintenance instructions for Sparton Motorhorns, with a cutaway diagram.
| Identifier | ExFiles\Box 49\5\ Scan130 | |
| Date | 1st January 1925 guessed | |
| CARE OF SPARTON MOTORHORNS EXPLANATION—The quality of tone and length of service of Sparton Horns depends entirely on the care of them. To produce the distinctive SPARTON tone, it is necessary the armature revolve at a high rate of speed. This speed is ....possible unless the bearings are OILED and the commutator and brushes CLEAN. The armature and field coils may burn out due to lack of oil, and if proper contact with the commutator is prevented by dirt or corrosion on the brushes, the quality of otne will be diminished on account of the reduction in speed of the armature, or the motor may fail to operate entirely. LUBRICATION—Oil once each month, using nothing but LIGHT, FINE OIL. Remove motor cover in rear and drop a few drops of oil at each end of the armature shaft in the oil hole or groove indicated on illustration. CAUTION—Do not use any oil except LIGHT, FINE OIL. CARE—IF SPARTON fails to give proper results after bearings have been oiled, set motor in motion by pressing button and SANDPAPER Commutator. After this has been done, clean air gaps between Commutator Segments with piece of wood. Do not use metal of any kind for cleaning air gaps. ADJUSTMENT—Turn adjusting screw in rear end of motor cover (a dime will serve as a wrench), to the right to tighten, to the left to loosen, until the desired tone is attained. CAUTION—Do not adjust too tightly. The armature should always turn easily (when turned by the fingers). IF THE SPARTON FAILS TO OPERATE—Don’t take it apart—you may lose some essential piece. Oil and clean carefully in accordance with the above instructions. If this does not cause it to operate, examine the wiring, battery and push button. If trouble is not apparent, send the SPARTON by parcel post to the nearest Service Station, with letter giving make and model of horn, length of service and description of the trouble. Repairs will be made at our expense, in accordance with our Guaranty, if any defect in material, construction or workmanship is apparent. Regular charge will be made for cleaning, oiling and adjusting made necessary by lack of attention on the part of the owner. Also for repairing horns in which parts not made by us have been installed or on which repairs have been made outside of our factory or SPARTON Service Station. In ordering parts for the SPARTON, always specify model and serial number of horn, which are designated by letters imprinted on the name plate. [Diagram Labels: SPARTON, OIL HERE, COMMUTATOR] | ||