Chorded keyboard (a writing system for the blind) uses either 6 or 8 tactile 'points' from which all letters and numbers are formed. When Louis Braille invented it, it was produced with a needle holing successively all needed points in a cardboard sheet. In 1892, Frank Haven Hall, superintendent of the Illinois Institute for the Education of the Blind, created the Hall Braille Writer, which was like a typewriter with 6 keys, one for each dot in a braille cell. The Perkins Brailler, first manufactured in 1951, uses a 6-key chord keyboard (plus a spacebar) to produce braille output, and has been
Matilda Ziegler Magazine for the Blind about half as much. In 2009, the magazine became an online version only, but by 2014, all publication was discontinued. The magazine was established to give people without sight access to articles from print periodicals in braille, New York Point, and Moon type format. Printed on brown paper using mostly recycled material, it was mailed in a large envelope, postage-free, because of an act of Congress. Only the cover had writing, which included the magazine name, address (20 West 17th Street), and the line, "Founded in 1907 by Mrs. William Ziegler and endowed by her so that blind people may