from The Century Dictionary.
- noun An apparatus for making a graphic record of the speed of a railroad-train or road-vehicle, or of the revolutions of a machine or motor.
Sorry, no etymologies found.
The flagman picked up his lantern and went forward; and in a minute or two later the index finger of the speed-recorder began to mount slowly toward the fifties.
Then he whirled around in the swing chair and scowled up at the little dial in the end of the car; scowled at the speed-recorder, and went to the door to summon the flagman.