Roper's catechism for steam engineers and electricians .. (1899)
Roper, Stephen. [from old catalog], Keller, Edwin R., [from old catalog] ed, Pike, Clayton W., [from old catalog] ed · Philadelphia, D. McKay · leaf 177
the difference between open andclosed feed-water heaters ? A. In closed heaters the exhaust steam passesthrough a series of brass tubes and the water ispumped through the space around the tubes intothe boiler, or the water may be jjumped throughthe tubes and the steam pass around the tubes.In the… … g M .S o S =« 2 STEAM ENGINEERS AND ELECTRICIANS. 157
Steam engineering · Electrical engineering
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