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 lamp, 182. Archimedes, 412. Armature, 162. Arteries, 358. Arterial blood, 359. Atmospheric pressure, 350. Auditory nerve, 272. Automatic brakes, 188; signalling, 228; stoker, 399. Backfall, 298. Balance-wheel, 419. Ball cock, 366, _367_. Balloon, fire.
Ft.| |in.|ft.| | ft.|ft. | in. Isaac Newton |333 |40·4 |10·0| |81 |12 | 21-1/2 |38·0|10·3| 32 Oregon |308 |35·0 | 9·6| 1,050 |72 |11 | 22 |31·6| 9·0| 33 New-York |276 |35·0 |10·6| |76 |15 | 18 |34·0|11·0| 28 Hendrick Hudson|320 |35·0 | 9·6| 1,050 |72 |11 | 18.