0055

Updated: April 30, 2025

At a pressure of 0.0055 mm., 0.066 millionth, the highest exhaust obtained in any of the experiments, even a one-inch spark from an induction coil refused to pass. It was also ascertained that there is neither condensacian nor dilatation of the gas in contact with the terminals prior to the passage of the discharge.

Various - Scientific American Supplement, No. 275, April 9, 1881

The commutator had 73 sections. The armature resistance was 0.0092 ohm, of which 0.0055 ohm was in the armature bars and 0.0037 ohm in the end-disks."

Frank Lewis Dyer - Edison, His Life and Inventions