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BTH full range | Low Pressure Sodium Lanterns

Sodra "H"
After the success of the Mercra "H" lantern with its controlled cut-off optics (semi-cut-off), the firm introduce this sodium version of the lantern in 1939.
??? 140 SO/H
BC Side Entry No Gear 1939 Programme


Sodium Enclosed Lantern
SL.721 140W SO
BC Top Entry No Gear 1950s book
1953 advert
SL.722 85W SO
BC Top Entry No Gear 1950s book
1953 advert
SL.730 140W SO
BC Side Entry No Gear 1950s book
1953 advert
SL.731 85W SO
BC Side Entry No Gear 1950s book
1953 advert


Sodium Open Lantern
SL.715 140W SO
BC Top Entry No Gear 1950s book
SL.716 85W SO
BC Top Entry No Gear 1950s book
SL.735 140W SO
BC Side Entry No Gear 1950s book
SL.736 85W SO
BC Side Entry No Gear 1950s book


Horizontal Sodium Open Lantern
?? 85W SO
BC Side/Top Entry No Gear Public Lighting #77
?? 140W SO
BC Side/Top Entry No Gear Public Lighting #77


Amber
?? 85W-140W SO
BC Side Entry No Gear 1955 Advert
?? 85W-140W SO
BC Side Entry Gear 1955 Advert