The Recording Speed Authority List provides data values for the Recording Speed element.
Audio Disk: 120 rpm
scope note: Use for both audio disks and cylinders. (rpm = revolutions per minute)Audio Disk: 16 rpm
scope note: Use for both audio disks and cylinders. (rpm = revolutions per minute)Audio Disk: 160 rpm
scope note: Use for both audio disks and cylinders. (rpm = revolutions per minute)Audio Disk: 33 1/3 rpm
scope note: Use for both audio disks and cylinders. (rpm = revolutions per minute)Audio Disk: 45 rpm
scope note: Use for both audio disks and cylinders. (rpm = revolutions per minute)Audio Disk: 50 rpm
scope note: Use for both audio disks and cylinders. (rpm = revolutions per minute)Audio Disk: 78 rpm
scope note: Use for both audio disks and cylinders. (rpm = revolutions per minute)Audio Tape: 1 7/8 ips
scope note: 1 7/8 ips = 4.75 cm/sec (ips = inches per second)Audio Tape: 15 ips
scope note: (ips = inches per second)Audio Tape: 15/16 ips
scope note: (ips = inches per second)Audio Tape: 3 3/4 ips
scope note: 3 3/4 ips = 9.5 cm/sec (ips = inches per second)Audio Tape: 30 ips
scope note: (ips = inches per second)Audio Tape: 7 1/2 ips
scope note: 7 1/2 ips = 19 cm/sec (ips = inches per second)Film: Silent at Sound Speed
scope note: Use for silent movies that are meant to be played at sound speed (24 frames per second) instead of a normal silent speed (18 frames per second).Videotape: LP
scope note: Long Play is a recording speed used for VHS videotapes. Generally, running time is 4 hours on a T-120 tape.Videotape: SLP/EP
scope note: Standard Long Play or Extended Play is a recording speed used for VHS videotapes. Generally, running time is 6 hours on a T-120 tape.Videotape: SP
scope note: Standard Play is a recording speed used for VHS, S-VHS, 8mm and Hi8 videotapes. Generally, running time is 2 hours on a T-120 tape.
Source:
http://www.archives.gov/research/search/lcdrg/authority_lists/recordinglist.html
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