The lantern was originally an eBay win, primarily purchased for some brackets, and had lost all it's original internal fittings; a piece of wood with an plastic GLS bulbholder had been installed instead.

Luckily I had the guts of one of these lanterns, and the correct glass refractor, so I ripped out the GLS bulbholder, and installed the original mercury bulbholder, focusing mechanism, enamelled refractor holder, and refractor.

These lanterns are often called 'Stepped REVOs'

All the paint was removed (it was originally painted back) and the aluminium polished up so well that I left it. Here, REVO and the lantern's catalogue number can be clearly read.

In this view, the "Road/Pavement" lettering on the enamel reflector can be seen.

The refractor is pushed into a sprung assembly and then is twisted, just like a bayonet bulb, into place. It obviously proved popular, and REVO used it for their subsequent 'Bell Top' fitting. The final top-entry mercury design, the Prefect, used a simplified version of this mechanism.

Inside a porcelean 3-pin bulbholder supports a mercury bulb. It's fitted onto the focusing mechanism, which allows the bulbholder to be mounted on various slots depending on the bulb type. This lantern could accomodate 60, 100, 150 and 200W GLS; and 80 and 125W MBF/U.

Again, this mechanism was used for the 'Bell Top' fitting, but a different approach was used for the Prefect.

Picture taken without flash.

And with flash.

This was an attempt to show off the sheer number of insects attracted to the light - of course, you can't see them.