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af
880
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INDEX
815
JPTwfe, Prof., 456
Whitehead, S. E., 423
Williams-MacPhee pusher, 286
Williams polysulphide process, 556
Willian, L. J., 423, 430, 470, 732
Wilton’s cyanide process, 554
direct »mmonia process, 549
Wind prf sure on gasholders, 631 JVinsor, 2
Wire ropes for cranes, 307
Wiring, electric, 350
Wood, C., 473
Woodhall-Duckham vertical retorts, 94,
148
Wright-Orsat apparatus, 130
Zimmer, G. F., 341
Printed in Great Britain by Butler & Tanner, Frame and London