APPENDIX. PERCENTAGE ERRORS OF CONTINUOUS CURRENT THREE-WIRE ENERGY MOTOR METERS (see page 26). TABLE A.-Armature circuit of meter connected across the outer conductors of the three-wire system,―i.e. energised by the total three-wire voltage. TABLE B.-Armature circuit of meter connected between the neutral main and one of the two outer conductors, and energised by the greater of the two voltages. TABLE C.-Armature circuit of meter connected between the neutral main and one of the two outer conductors, and energised by the smaller of the two voltages. The above tables are based on the article "Behaviour of Continuous Current Three-wire Energy Motor Meters" on page 26, Chapter II., from which they can be readily verified. NEW ELECTROLYTIC METERS. SINCE going to press some interesting electrolytic meters, embodying several novel features, have been brought out by Messrs Mordey & Fricker and by Mr S. H. Holden, the details of which were, however, received too late for publication. For this reason only a passing reference can be made to them. A very good description of the Mordey-Fricker prepayment electrolytic meter will be found on page 549 of the Electrical Review, vol. 57, 1905; and for the features of the Holden meters the reader is referred to the paper, "Two New Electricity Meters," read by Mr Holden at the meeting, December 13, 1905, of the Birmingham Section of the Institution of Electrical Engineers. Duncan meter, 287. Aron clock meter- battery types, 95. house-service type, 70. maximum demand, 248. polyphase (three- and four-wire), 194. spring cyclometer counter of, 298. Bat two-rate meters, 279. Deutsch-Russische, 97. Siemens-Schuckert, 99. Battery systems- British Thomson-Houston one-meter, 94. Bearings- Duncan Visual,' 293. jewel, 287. meter, 287 et seq. Siemens-Schuckert, 289. Stanley rotated, 295. Thomson, 289. Beaumont, F. J. (prepayment meter), 223. energy motor meters, 26. of three-phase three-wire induction meters of three-phase three-wire meter wrongly of three-wire single-phase induction Board of Trade- error limits, 5. meters approved by, 16. unit, 1. Braulik, G., meters of (see Luxsche British Thomson-Houston Company- O'K. ampere-hour meter (two-wire), 43. one-meter battery systems, 94. prepayment meter, 227. Thomson house-service meter, type A, 54. switchboard (astatic) meters, 100. two-meter battery system with ratchet and pawl, 92. two-rate meters, 279. Brush-Gutmann induction meter, 157. law of the, 23. Clock meters for special purposes, suitability Compagnie Anonyme Continentale pour la prepayment meter, 230. Compagnie pour la Fabrication des Comp- A.C.T. induction meter, 171. O'K. ampere-hour meter (two-wire) 43. three-wire meter, 46. prepayment meter, 243. Thomson meter, 55. two-rate meters, 274. ECLIPSE ampere-hour motor meter, type induction meters, types F.E.G. and Effect of over-compensation and under- of wrongly connecting a three-phase three- oscillating, types K. G. and G., 77. three-phase, 200. two-meter battery system, 92. two-rate, 263. Electrical energy, 18. quantity, 18. Electrical Standards Laboratory, 5. Electro-magnetic action, 20. meters, 2. FERRANTI ampere-hour motor meters, 37. Fort Wayne induction meter, type K, 162. polyphase meter, 202. prepayment meter, 231. electrolytic prepayment meter, 318. Frictional resistances (motor meter), 53. magnet Magnetic brake, law of the, 7. condition for use of one single-phase, (three-phase three-wire system), 189. Deutsch-Russische, 145. Eclipse, types F.E.G., F.E.M., 180. Electrical Company's, 135. Ferranti-Hamilton, 160. field, rotatory, 110. suspension, Evershed, 297. Stanley, 294. Manchester system, 211. Maximum demand indicators- approved by the Board of Trade, 17. Aron, 248. Atkinson-Schattner, 250. definition of, 248. Fricker, 251. Merz, 256. |