This new Steam Generator combines essential advantages In Absolute Safety from explosion. in first cost. and cost of repairs durability economy of fuel facility of cleaning and transportation not possessed by any other boiler. It is formed or a combination of east-iron hollow spheres.-each 8 Inches in external diameter and %the of an inch thick connected by curved necks These spheres are held together by wrought Iron bolts with caps at the ends. The form is the strongest known: its strength to resist internal pressure very great-unweakened as it is by punching or riveting which lessens the strength of the wrought iron boiler plate about forty per cent. Every boiler is tested by hy draulic pressure at 400 pounds to the square inch. It cannot be buret under anv practicable steam pressure. Under pretsure which might cause rupture in ordinary boilers every joint in this becomes a safety valve. No other steam genera tor p ossesses this property of relief under extreme pressure without iniury to itself and tsus preventing disaster. It is not affected by corrosion which seen destroys the wrought line of this surface which thoroughly mixing the gases induces better combustion and breaking the flame causes the heat to be more effectually absorbed than In the ordinary tubular or cylinder ooiler. It gets up steam quickly and with lisle fuel. It produces super heated steam without separate apparatus and is not liable to prim ng or foaming. It is essily transnorted. and may he taken apart so that no piece need weigb mere than eighty pounds. In difficult places of access. the largest boiler may be put through an opining one foot square. It is readily cleaned inside and out Under ordinary circumstances acility as they are uniform in shape and size. When renewed the entire boiler rernalosas good as new. The greater part of the boiler than one-half the ground area of the ordinary cylinder boilerwithout being Increased in bight Aug kind of fuel may he used under this boiler from the
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