research
 Patents
 Books
 Literature
 Articles
 Timeline
 Auction Archive

about
 About this site
 Wanted to buy
bulb gallery

Incandescent:
C
 carbon
WD
 drawn tungsten
WC
 coiled tungsten
WM
 mini tungsten
WS
 pressed tung.
FG
 figural bulbs
XL
 christmas
XS
 christmas sets
T
 tantalum

Discharge:
HE
 helium lamps
NE neon lamps
AR
 argon lamps
XE
 xenon lamps
MA
 mercury
MC
 fluorescent
MS
 special mercury

Hardware:
F
 fuses
FX
 fixtures
PF
 plugs & fittings
SA
 sockets
SW
 switches

tube gallery

 X-ray
 Geissler
 Crookes
 Radio
 Box art

collector
profiles

Dr. Hugh Hicks
S.Slabyhoudek
M-Jay
Fort Myers, FL.
Monsieur Ara
Fin Stewart

links

 Related links
 Submit a link

 

wc0013  

 

  
history and origins
 
Manufacturer / Brand Name
 Royal Ediswan Pointolite
Country of Origin
 England
Factory Location
 Unknown
Date of Manufacture
 ca.1924
 
electrical attributes
 
Voltage
 Unknown
Wattage / Candle Power
 100cp

Amperage
 

physical attributes
 
Envelope
 3.00" Dia.		 Atmosphere
 Gas Filled
Finish / Color
 Clear 		Filament
 Coiled; Tungsten Sphere
 
Base
 Edison; Medium 		 
 
comments
  Royal Ediswan DC operated Pointolite arc lamp fitted with a special three contact Edison medium screw base. This particular sized lamp was specially suited for small projection and microscopic work. There is a glass deflector within the lamp that is used to collect disintregrated tungsten particles. This feature was patented Feb.13th, 1919 by the Edison-Swan Electric Co. and P. Freedman (British Patent #142,574).