Beard 'Eclipse' lantern slide carrier for 3 1/4" x 4 1/4" slides

Beard 'Eclipse' lantern slide carrier for 3 1/4" x 4 1/4" slides, one of two, by R.P.Beard with original instruction sheet (in original box) and with one unmarked lantern slide carrier.

Robert Royou Beard was a British inventor and manufacturer of magic lantern accessories. He developed a regulator which held the gas pressure in dissolving lanterns at the correct levels as well as the Eclipse self-centring slide carrier, which allowed slides to be changed without the operator having to lean over the lantern and also ensured that the screen was never blank.