t of 210 degrees showed that
the capacity of a mechanical atomizing burner of the Peabody type
increased from 80 degrees Fahrenheit to 110 degrees Fahrenheit, from
which point it fell off rapidly to 140 degrees and then more slowly to
the flash point.

The above methods, together with the regulation possible through
manipulation of the boiler dampers, indicate the wide range of load
conditions that may be handled with an installation of this class of
burners.

As has already been stated, results with mechanical atomizing burners
that may be considered very successful have been limited almost entirely
to cases where forced blast of some description has been used, the high
velocity of the air entering being of material assistance in securing
the proper mixture of air with the oil spray. Much has been done and is
being done in the way of experiment with this class of apparatus toward
developing a successful mechanical atomizing burner for use with natural
draft, and there appears to be no reason why such experiments should not
eventually produce satisfactory results.

Steam Consumption of Burners--The Bureau of Steam Engineering, U. S.
Navy, made in 1901 an exhaustive series of tests of various oil burners
that may be considered as representing, in so far as the performance of
the burners themselves is concerned, the practice of that time. These
tests showed that a burner utilizing air as an atomizing agent, required
for compressing the air from 1.06 to 7.45 per cent of the total steam
generated, the average being 3.18 per cent. Four tests of steam
atomizing burners showed a consumption of 3.98 to 5.77 per cent of the
total steam, the average being 4.8 per cent.

Improvement in burner design has largely reduced the steam consumption,
though to a greater degree in steam than in air atomizing burners.
Recent experiments show that a good steam atomizing burner will require
approximately 2 per cent of the total steam generated by the boiler
operated at or about its rated capacity. This figure will decrease as
the capacity is increased and is so low as to be practically negligible,
except in cases where the question of loss of feed water is all
important. There are no figures available as to the actual steam
consumption of mechanical atomizing burners but apparently this is small
if the requirement is understood to be entirely apart from the steam
consumption of the apparatus producing the forced blast.

Capacity of Burne