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).
Page 3 of a document from The Trippe Safety Speed Light Co. describing a lamp and its bulb mask.
| Identifier | ExFiles\Box 167\1\ img009 | |
| Date | 2nd September 1935 guessed | |
| THE TRIPPE SAFETY SPEED LIGHT CO. LTD. LIVERPOOL, 3. - 3. is interfered with at all, and very little of the reflected light, with a nett result that a TRIPPE lamp mounted correctly and functioning as tested in the Factory, gives an exceptionally powerful, flat-top beam, with no rays going above the top. The glass lenses supplied vary the amount of concentration as required. Location of Mask on Bulb and shape. | ||