ROEDER, CARL M. A practical keyboard harmony.

Essay on the true art of playing keyboard instruments.

R56323, 27Dec49, Mazo de la Roche (A) EXTEMPORE PLAYING (forty lessons in the art of keyboard composing) by A. Madeley Richardson.

A Primer for practical keyboard modulation for the piano.

[symbols accompanying written text to signify modified interpretation] keyboard symbols, printing symbols; [Symbols for emphasis], red letter, italics, sublineation^, underlining, bold font; jotting; note, annotation, reference; blaze, cedilla, guillemets^, hachure

The method was first tried with human subjects in the Psychopathic Hospital, Boston, with a crude keyboard apparatus which, however, proved wholly satisfactory as a means of demonstrating its value.

One involves direct keyboard transmission; the other, the use at the sending end of a perforated tape capable of being run through a transmitting machine at high speed.

The five-inch roll of paper, perforated by the keyboard machine (a hole for every letter), gives the signal by means of compressed air to the mechanism that puts the matrix (or type mould) in position and casts the type letter by letter, each character following the proper sequence as marked by the perforations of the paper ribbon.

In another type of direct keyboard operation the manipulation of the keys transmits the impulses directly to the line and the receiving apparatus translates them by electrically controlled mechanical devices into printed characters in message form.

For half an hour, Mark tried voice commands and combinations of keyboard strokes, but made no progress.