54 MODERN STEAM PRACTICE . best plan for superheating the steam ; far before the complicated arrangements of separate superheating boxes , with the extra stop - valves , & c . In fact , dry superheaters soon get out of Order , more especially when there is no steam in the boilers , as must be the… … Longitudinal Section . Front Elevation and Transverse Section . Fig . 28 . - — High Double Boiler . aa , Furnaces . B , Combustion chamber . cc , Tubes . d d , Smoke - boxes . ee , Uptakes . for a considerable time when the fires are first kindled . Any one can fancy the flame acting on a thin tube…
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