updates as info becomes available
The word Ligne is old French origin and was used as a length measurement

The description 'Line lamp' is of German origin Line correct spelling Ligne sometimes written "' indicates the Brightness of the Lamp, this can also be expressed as Candle Power [CP], Watts, [w] Lumen's [LU] and other words chosen by Eurocrats.

The Brightness of a Lamp depends on a lot of factors, Fuel & Wick quality, Air Flow, Chimney Heights and Diameters, Atmospheric pressure and quality, sometimes sheer perversity.

A 20"' lamp with a circular wick is about 50 Candle power

Describing a Lamp as a 12 or 14 line lamp has the added benefit of capturing the customer into buying 20 or 30 line wicks, stamped with the Manufacturers Name and the Line Value

.Some Line Lamps require Tubular Wicks, if yours is one of these you may need to contact me, others are Standard Flat Wicks in a Kosmos or Matador Burner which turns them into a tube formation.

CAUTION The line rating of the wick has no bearing on the Chimney size

Take the wick out lay it flat and measure the width in inches then go to flat lamp wicks and select the nearest,
1/16 - 1mm of an inch under can be forgiven., but not over

English Kosmos ( also modern imported Repro) Flat wicks 6"' 1-3/8 8"' 1-5/8 10"' 1-15/16
12"' 2-1/4 14"' 2-5/8

Imported DHR Lamps
Pantry Lamp - Large Table Lamp - French Ceramic Base Lamps all use 2-1/2" flat wicks

Small Table lamp - Trawler Lamp - Engine Room Light all use 1/38" Flat wicks 

Lamp name  Possible wick    Use this Wick

Ariel 30"' Lamp

    Valor No 22 wick

Very similar to the POD Small Soft no carrier 60"'

And the Raydyot Heater

Court Orion & Defries 16 line

Lamp Belge 14 line
Juno, Venus & Viking 14 line

 Belguim Wick
1-3/16 Tube" x7-1/2" Long x 2"Tails 1/8" wall 

Model 237A - 360 - 564A - 731A - Raylite

May suit

 Defries 1, English Sun 15"', Nunslite, Marvel 15"' Lamps

Eltex 1505 Tubular 
1" inner tube dia 1/8" wall wick
Watch out for wick wall thickness

Hinks (1898) Lamp

POD small soft no carrier

 do not have a paper insert and are not charred

Model 237 - 564 - Jnr Blulite

Also fits the Hinks 20"' by King & Co 

make sure the tails miss the winders 

Eltex 1458 wick

inner tube  dia

 10" long with 8" pointed tails

Lampe Belge & Trilux 30 line

Plume & Atwood wick 
Miller no 3 wick