Reasons for not using Triplex glass on the front wing screens of 20 HP cars.
| Identifier | ExFiles\Box 137\5\ scan0155 | |
| Date | 13th November 1922 | |
| COPY. To BJ. LHS {Lord Herbert Scott - Chair} 6/LH {Mr Haworth} 13.11.22. No. 6 GOSHAWK(Aero Engine)(Codename for 20HP Car / Aero Engine after Kestrel(Aero Engine)). With reference to R3/M16.10.22 we are not using Triplex glass in the front wing screens of 20 h.p. cars for the following reasons: (1) After a comparatively short exposure to sunlight it discolours - assuming a yellowish tinge, due to the action of the sun on the celluloid employed in the manufacture of the glass. (2) In tropical climates such as that of India(Production 20 HP. with 4-speed box and Front Wheel Brakes) it disintegrates. (3) It is expensive. (4) It is heavier than ordinary glass. We are, of course, fully alive to the danger of the breakage of large moveable panels of glass as a result of vibration set up by the car travelling over bad roads, and to counteract this, we have arranged for the upper panels of the front screen, i.e. the only panels which are moveable, to be vertically divided in the centre, on the stock bodies. (Sgd.) L.H.S. Hs {Lord Ernest Hives - Chair} RECEIVED NOV 15 1922 | ||
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).