1851 Great Exhibition: Official Catalogue: Class X.: Abraham, Abraham and Co
263. ABRAHAM, ABRAHAM, and CO., 20 Lord Street, Liverpool — Manufacturers.
Trinoptric prismatic lantern, with apparatus for making oxygen gas, viz.: gas bag, retort, and purifier, invented by the Rev. St. Vincent Beechy. It combines the powers of three lanterns, with one small lamp of intense brightness. A disc of 25 feet for each tube may be obtained, and each disc is capable of being darkened to any required extent, without shadow on any portion of the picture.
Dioptric prismatic lantern, producing two in lieu of three discs.
Compound miscroscope, exhibited for workmanship.
Portable sketching camera obscura. In the optical arrangement, a meniscus and prism are employed in lieu of a lens and mirror, and a vivid flat picture is obtained.
[The trinoptric and dioptric lanterns exhibited, are for the purpose of producing panoramic and other pictures, generally displayed by means of the phantasmagoria lanterns and dissolving-view apparatus. The lamp employed is an oil-lamp, supplied with oxygen gas, on the principle of the Bude light.]