The Topeka state journal. [volume] (Topeka, Kansas) 1892-1980, 1909-07-09
Work of FL. w. Jacobs and F.W.
Shupert of Santa Fe.
EXCELS IN MANY WAYS
Is Being Tested Between Needles
and Seligman.
other Items of Interest in
Railway Circles.


revolutionize the art of boiler making
is being tested by the Atchison, To-
peka & Santa F'e Railroad company
on the Arizona division from Needles
to Selfgman and on the coast lines,
says the Railway Record. 1t is the
work of H. W. Jacobs. assistant su-
perintendent Of motive power at To-
peka, Kan, and F. w. Shupert. boiler
maker foreman at San Bernardino,
Cal
The Jacobs-Shupert frebox is
radical departure from the usual
form of locomotive boiler construc-
ton The usual fat frebox sheets
and outer shell are replaced by sets
of channel sections securely r1Veted
together and the usual form OF
troublesome staybolt is replaced by
stay sheets, except at the front and
door sheets
The Jacobs-Shupert hrebox has
been devised to obtain certain def
mite objects in the improvement of
locomotive boilers and while the
boiler with the Jacobs-Shuperr ire
box applied has been in service
comparativeIy short time. the indica-
lions are most favorable This fire
box represents years of careful in.
vestigation and study on the part OF
men In position to observe locomotive
boiler operation and maintenance
very closely, one of these men BENG
a practical boilermaker foreman.
During the process of development,
many capable mechanical men have
passed Judgment on the principles in
volved and in a number OF instances
their ideas have been embodied In the
design.
Among the several advantages of
the sectional form of construction,
the principal are: An unusual ele-
ment of safety; provision Tor ex-
pansion and contraction, due 10
Variations in temperature; improved
vertical circulation of water; &C
CELEBRATION of scrubbing action of
water against the hot metal surface;
increased heat transmisslon; greater
evaporation per unit of heating sur
face and increased area of heating |
surface.
In the sectional frebox a possible |
rupture is confined to a single sec
ton and the destructive effects OF an /
explosion would be confined to the |
simple escape of the contents of the |
boiler. It is the sudden tearing away |
of a large area in cases OF faIIure IN
the ordinary crown sheet that causes |
violent explosions and consequent
disastrous results. In the sectional
firebox the tearing away OF large
area is impossible, as the rupture
cannot extend from one section to
The arched sectional form of con-
struction provides for expansion and
contraction due to variations IN
temperature Each section is free to
expand or contract without produc-
ing excessive local stresses or trans
hitting undue stress to adjacent sec
lions. The entire structure is flexible
and while expansion and contrac-
ton occur. the form and construc-
ton of each section allows it to ex-
Dand without straining the next sec
ton. thus relieving any stresses in
duced by temperature variations. L
The holes for horizontal circula- Il
ton through the radial stay sheets
are of ample area to replace the II
water evaporated. The enlarged II
space within the individual sections Il
encourages rapid vertical circulation
and the more rapid this circulation L
the greater the securing action of II
the water against the hot metal.
The corrugated surface of the fire.
box is effective in causing turbulent
motion among the hot gases, and Il
this rotating whirling motion brings
successive portions of the gases in
contact with the metal. Such a
whirIing securing action of the gases
produces highest efficiency in trans Il
hitting heat from the gases in them
selves as well as in breaking through /
the film of inert gases which tend to Il
collect in thin layers along the sur
face of the metal.
It has long been recognized by II
authorities in heat transmission that
by producing q turbulent, scrubbing II
action of the hot gases against the II
fire side of the metal and by accelerat-
ing the scrubbing action of the water
against the hot surface. the evapora- Il
tive value of the heating surface is
largely increased