The Standard Electrical Dictionary
(a) In telegraphy the return stroke of the lever in a telegraph sounder, striking the end of the regulating screw with a sound distinct from that which it produces on the forward stroke as it approaches the magnet poles. It is an important factor in receiving by ear or sound reading. (b) See Back Shock or Stroke of Lightning.
The numerical value of back stroke in Chaldean Numerology is: 4
The numerical value of back stroke in Pythagorean Numerology is: 6
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