Tubular Discharge Lamp
A discharge lamp of tubular form either straight or curved.
Note: In German usage, such a discharge lamp is called Leuchtroehre if it contains no luminescent material and operates at high voltage (up to about 6,000 volts).
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM