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).
The design and construction of a neon vacuum lamp for stroboscopic work.
| Identifier | ExFiles\Box 79\1\ scan0258 | |
| Date | 19th February 1920 | |
| - 2 - THE FORM OF LAMP. The original form of the lamp, which it has not been found necessary to alter materially is shown in the sketch. As, in the discharge in Neon, nearly all the light is in the "Positive Column" and its brightness increases with the current density, the lamp was designed to give a positive column as long and as narrow as possible, consistent with the potential available in the spark, and consists essentially of two relatively large spaces containing the electrodes connected by a very long capillary tube which is the counterpart of the filament in an ordinary glow lamp. In the lamps in use the [Image of a Neon Vacuum Lamp] ANODE CATHODE Neon vacuum lamp for Stroboscopic work. Two-thirds actual size. filament is about 60 cm. long by 1 mm. diameter and is coiled up inside the space containing the anode. This was done for convenience and strength, but it has another and important advantage, for this type of construction is strongly ( Contd. ) | ||