es placed in the body of the boiler . In modern practice the blast orifice is a con - siderable distance from the crown of the smoke box , just above the top row of tubes : this has been found , with a wide spreading funnel , or even with the usual taper , to create a superior draught with a wider… … Fig . 420 . — Safety Valves . a , Dome . b , Cast - iron top for dome . c , Safety valves and seats . d , Lever . e , Stud for lever . the fire - box shell . In the latter case a third valve may be fitted on the top of the steam dome on the boiler , which is loaded directly by means of a spiral…
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