1851 Great Exhibition: Official Catalogue: Class X.: James Gall
687A. GALL, JAMES, Myrtle Bank, Edinburgh — Inventor.
Gall's triangular alphabet for the blind, which, by its similarity to the common Roman alphabet, is easily read by the eye, and may be taught without previous instruction. This alphabet is considered as an improvement on circular alphabets, by its angular form; the letters are rendered more distinct to the touch; and by the exclusion of the capitals, the attention of the blind is concentrated upon 26, instead of 52 letters, and the size of the printing may be reduced.
Volume, containing the Epistle to the Ephesians, printed for the blind, in Gall's triangular alphabet, with the letters serrated.
Gall's apparatus for writing by and to the blind. The blind can, by this invention, readily correspond by post, and can keep books and other memoranda. The apparatus consists of a stuffed frame on which the paper is placed; of a cover with bars to guide the lines, which are written from the bottom upwards; and of small stamps, with the letters formed of common pins, which are pricked through the paper and read on the opposite side. By means of the two register points on each side of the frame, and by shifting the cover one half line up, the paper is written on both sides, each perfectly legible either by the fingers or the eye.