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).
Translated article explaining the construction and economy of Cable Tyres compared to canvas tyres.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page134 | |
| Date | 1st August 1920 | |
| X.20 O M N I A.{Mr Adams} August 1920. (Page 332) TRANSLATION. C A B L E T Y R E S. This improvement is chiefly a question of economy. The new method of construction of pneumatic tyres which we are going to explain decreases the price of car mileage, as regards the tyres. This is the practical result of this new principle of construction. Does the Cable tyre cost less than the ordinary tyre? Not at all, its price is about 15% more, but it lasts about twice as long. Its running qualities effect an economy in consumption of about 30% (I am aware authentically of some Cables which have run 6213 miles on the rear of heavy rapid cars). Moreover by the improvement of the suspension it spares the car a strain which it is as impossible to figure out as it is to deny. We shall now examine in what way these factors of economy have been realised in this new pneumatic tyre of Michelin manufacture. CANVAS TYRE AND CABLE TYRE. The material of a pneumatic tyre consists of two elements rubber and a cotton canvas. The first is of less importance than the second since the principal material is canvas. The increase in price of the pneumatic tyre is due to a very small extent to the relatively small increase in the cost of rubber, but comes in greater measure from the enormous increase in the cost of the canvas, and the chemical products which are used in the manufacture of the tyre. Regarding the "Rubber" of the Cable we shall say only a few words. The tread is of the R.U. typo which we have already shewn to our readers on numerous occasions (Figure 1.) The "Canvas" alone will be dealt with because it is that element which bears all the improvements referred to. Nearly everybody knows how a cotton tissue is manufactured. The cotton filaments have been assembled by the spinner in small strands. Four or five small strands alike have then been twisted together, which constitutes what is generally known as a thread, thus a cotton "thread" | ||