1. Recorder is a machine for preserving sound, video, or data signals in the sequence in which they occur. Example, DISC RECORDER, TAPE RECORDER, and WIRE RECORDER).
2. It is a machine for making a permanent visual record (photographically or by stylus) of an electrical phenomenon. Examples: DRUM RECORDER and OSCILLOGRAPH.
See also, Recording Disk, Recorded Disk, Recording Tape, Disk Recorder