f which are of European make. sulted from time to time by leather manufacturers, ‘““During the past few months there has been con- A three-phase alternator which is of considerable in- siderable controversy among. the principal bookbind- who have found difficulty in dyeing level, that is, ob-… … leathers for furniture ‘purposes field: magnet is 95 revolutions per minute, and the frequency . should not be dyed with the acid colors together at this spced is 50 periods with the addition of sul- per second. The field mag- nets consist of 64 pole phuric acid. If the acid pieces, which are…
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