Lantern acquired in April 2007.
Thanks to Claire for this lantern, which came from the Nottinghamshire area - an area where many Geminis can still be found. The Gemini was originally a Relite product but following the company's collapse in the 1980s, later examples (such as this one) were made by Simplex. A handful of Geminis exist around Derbyshire although they are few-and-far between. The Aries, a sister product of the Gemini (but not a twin!), is a lot more popular - the only real difference being that the Aries features a GRP canopy and has a slant.
The Diadem is in a fair condition although the aluminium canopy is quite corroded. Oddly, a two-part cell is employed despite the lantern being gear-in-head.
The canopy itself is quite boxy in comparison to those of other 55 W lanterns - such as the GEC Z9536 series.
However, like the GEC lantern, the underside of the bowl is free of refractors.
The corrosion is worse on the inside of the canopy. A replacement ballast has been fitted at some point - it has been installed upside-down for some reason!
Thorn Beta 7 | Simplex Lucidor
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