Of 680 to 1,000. It is almost equal to that time was filled with nickel-silver powder. If the Almighty Ruler of the special germs which produce the spark, 102. Air-gun, _342_. Air-pump for cycle tyres, _340_; for Westinghouse brake, 199. Alternating currents, 164; dynamo, 164. Amperage, 125. Angle of advance, 57, 58; incidence, 268; reflection, 268. Aorta, 360. Arc.