4m. The Former John Smith Clock Works, Queen Street, Derby City Centre. To the rear of this disused factory is an ELECO HW-851 open mercury lantern on a short top-entry wall bracket. The factory has been closed for many years and so I would think that the lantern has not worked since it closed. An elliptical lamp is still intact in the lantern - it is perhaps a 'blended' mercury vapour lamp, with a tungsten filament wired in series with the arc tube, in order to act as a ballast.

 

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