isfactory
operation under conditions which are perhaps more exacting than those of
any other service.

Time, the test of all, results with boilers as with other things, in the
survival of the fittest. When judged on this basis the Babcock & Wilcox
boiler stands pre-eminent in its ability to cover the whole field of
steam generation with the highest commercial efficiency obtainable. Year
after year the Babcock & Wilcox boiler has become more firmly
established as the standard of excellence in the boiler making art.

[Illustration: South Boston Station of the Boston Elevated Ry. Co.,
Boston, Mass. 9600 Horse Power of Babcock & Wilcox Boilers and
Superheaters Installed in this Station]

[Illustration: 3600 Horse-power Installation of Babcock & Wilcox Boilers
at the Phipps Power House of the Duquesne Light Company, Pittsburgh,
Pa.]

EVOLUTION OF THE BABCOCK & WILCOX WATER-TUBE BOILER

Quite as much may be learned from the records of failures as from those
of success. Where a device has been once fairly tried and found to be
imperfect or impracticable, the knowledge of that trial is of advantage
in further investigation. Regardless of the lesson taught by failure,
however, it is an almost every-day occurrence that some device or
construction which has been tried and found wanting, if not worthless,
is again introduced as a great improvement upon a device which has shown
by its survival to be the fittest.

The success of the Babcock & Wilcox boiler is due to many years of
constant adherence to one line of research, in which an endeavor has
been made to introduce improvements with the view to producing a boiler
which would most effectively meet the demands of the times. During the
periods that this boiler has been built, other companies have placed on
the market more than thirty water-tube or sectional water-tube boilers,
most of which, though they may have attained some distinction and sale,
have now entirely disappeared. The following incomplete list will serve
to recall the names of some of the boilers that have had a vogue at
various times, but which are now practically unknown: Dimpfel, Howard,
Griffith & Wundrum, Dinsmore, Miller "Fire Box", Miller "American",
Miller "Internal Tube", Miller "Inclined Tube", Phleger, Weigant, the
Lady Verner, the Allen, the Kelly, the Anderson, the Rogers & Black, the
Eclipse or Kilgore, the Moore, the Baker & Smith, the Renshaw, the
Shackleton, the "Duplex", the Pond & Bra