e repacked, and the liquid ammonia drawn off from From the dome of the upper boiler a pipe leads through a lever, L', and displacing the slide valve, T, will put the ap- the two last condensers, which must again be filled with preliminary condenser, the condensed liquor being brought paratus… … simplified and becomes’ more of the piston packing (which is rub economical the larger the works, ber), all the parts are of metal. and it can safely be said that no ap- There is hardly any need of speak- paratus is more efficient and gives ing of the applications which may purer products. In…
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