In large marine engines for ocean-going vessels, Avhere economy of fuel is specially considered, a result of 1J lb.
If a specially prepared cheap gas be used — the DaAA'son gas — the consumption Avorks out at 13 lb of coal per horse-poAver per hour.  In large marine engines for ocean-going vessels, Avhere economy of fuel is specially considered, a result of 1J lb.  of coal per horse-poAver per hour is regarded as satisfactory.