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).
Comparison of standard, slotted clamp, and bolted type fuse holders.
| Identifier | ExFiles\Box 50\1\ Scan198 | |
| Date | 20th August 1924 | |
| EFC. {E. Fowler Clarke - Electrical Engineer} 20.8.24. COMPARISON OF VARIOUS RR. FUSE HOLDERS. Of three types examined, standard, slotted clamp type and bolted type, the last appears to be the most satisfactory all round. It is as easy to manipulate as the standard; it is made from non-special parts and tends to hold the whole thing together. The nut and bolt are easily replaceable in case the thread strips etc. A good surface is ensured. The slotted clamp type is not very easy to re-fill. The wire is difficult to crumple into a suitable ball and the length has to be gauged before fitting. The pressure is so localized that several attempts were made before a wire could be fitted without being cut off by the screw, even with a packing of old wire underneath. This last is liable to be flattened out and become difficult to remove, when necessary. Too large a ball of wire diminishes the length of screw thread engaged. There is no provision for locking the screw. The slotted part is liable to widen and so cause wire to jam in the thread. The standard has no apparent advantage over the bolted type. EFC {E. Fowler Clarke - Electrical Engineer} /A. | ||