1. (n.) A kind of writing frame for the blind.

2. (n.) An instrument or register which records the presence of watchmen on their beats.

Boston type New York point Optacon Pathsounder Seeing Eye dog Visotoner cane embosser guide dog high-speed embosser line letter noctograph optophone personal sonar sensory aid sight-saver type string alphabet talking book ultrasonic spectacles visagraph writing frame writing stamps