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).
Continued technical memorandum discussing specifications for brush holder spindles, end bearings, and hoist mechanisms.
| Identifier | ExFiles\Box 181\M7\ img015 | |
| Date | 12th August 1912 guessed | |
| -5- Messrs Royce Ltd(contd) be worth the extra money spent upon it. With reference to the brush holder spindles, these should in all cases be very substantial & rigid so as to keep the carbon brushes steady, and I think the square shank type of spindle which we got out here and the serrated back to the brushes should make an excellent scheme. The short re-ac-tance brush should be used wherever possible for machines run-ning in one direction. Referring to the end bearings of the smaller machines which are attached to the yokes, these should have am-ple long spigots, the flanges on the arms should be turned in-wards so as to give a clean outward appearance as in the case of the Rolls-Royce testing dynamos. The webs of these bear-ings should be very deep & rigid. With reference to hoist work, I have carefully considered the question of pulling the hoist up quickly, and in addition to the points I have before mentioned, I would like to emphasize that the brakes on the hoist should be made to act rapidly & powerfully but without jerks, and to do this easily it is advisable to have a fairly high speed motor and brake of different type to the one we are using at present because this has too much inertia to move on and off quickly, and I emphasize that every hoist should be counter-balanced equal to the full weight of the cage & or 1/3rd of the load. The motor, how-ever, should not be too small for the work and should be arran-ged to give as constant a speed as is reasonably possible be-tween the required load as a generator and the required load as | ||