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).
Blueprint for an indoor type insulator designed for supporting grooved trolley wire, with assembly instructions.
| Identifier | ExFiles\Box 180\M6\ img085 | |
| Date | 2nd January 1927 | |
| N26 N22 N29 N27 -N26 but with 4 holes (2 for filling) instead of 2. Stem to be shortened to 3/4". Unscrewed portion to be undercut. 1/32" thick washer made from No.1 Grade Varnish-Fabric Board. J83468 but tapped 2" whit. J83469 INSTRUCTIONS FOR ASSEMBLING. 1) Bottom fitting must be fixed in place first. 2) Top space must then be filled with sulphur and glass 3) Then top fitting should be fixed in place. 4) Finally bottom space must be filled with sulphur and glass by means of the two holes provided. INSULATOR for supporting grooved trolley wire. (INDOOR TYPE). B/52 Scale:- Full size. 2.1.27 | ||