St. Paul daily globe. [volume] (Saint Paul, Minn.) 1884-1896, 1891-09-13
Mems Pants,
sl.oe,
Worth $3.50, $500 and
$3.50.

strated that the twenty volumes of
steam failed to do the work that
two volumes of steam combined with
sixteen volumes of heated air did. They
further showed that the best results
were obtained with these proportions of
these two fluids, and these are about the
proportions which Mr.. Field employs IN
practice.
1t should be observed that in prac-
tice the air is heated at little or no cost
by the waste heat which, in an ordi-
nary engine, escapes into the atmos-
phere.
The. principles here involved have
been put in practice by Mr.. Field in
portable engine, which, however, has
several drawbacks in consequence of
the mixing chambers having to be SUI
peradded to the existing engine works.
These chambers are mounted on the top
of the engine cylinder, and there is
chamber for each end of the cylinder.
Each of these chambers in turn receives
its charge of heated air, into which
is delivered proportionate charge
of steam. The mixture is delivered
from each chamber alternately to the
front and the back end of the cylinder.
causing the ont-strokes and the in
strokes of the piston in succession.
Upon the occasion of our visit the
engine was first run with steam alone
and without load. 1t was then run
with combined steam and heated air in
about the proportions previously stated.
The conditions under which this
run was made were the same as in the
previous run, and the same observations
were taken. 1t may be mentioned that
the temperature in the air chamber
should not be less than 400 deg. Fair.
Tor the proper development of the
advantages of the system. As
matter of fact the air temperature
during the engine trials was not
higher than 300 deg, but was gen.
orally much lower. owing to the draughts
and to the inefficient construction of
the heating apparatus. On comparing
the results of the two engine runs made
respectively with pure steam and with
combined steam and heated air, it was
found that there was an absolute gain
of Al per cent in favor of the Field sys-
TEN as against ordinary steam.
The system, as we'll as the expert
mental apparatus, has been iupepend-
emily tested by three engineers, name
~, Collett HOmersham, c. E.; ID. K.
Clark, @. E.; and Perry F. Nursey. G.
E., each of whose reports substantiates
this economy and points to still
higher results with a lBrger ell
CINE properly and efficiently fitted
with the necessary adjuncts for
working upon Mr.. Fields prin-
ciple. This, in fact, is what is now be-
ing done, and in due course the results
will be arrived at and made known.
Should they confirm tile results already
attained-and there does not appear
to be any reason why they should not
Mr.. Fields discovery can not fail to
produce complete revolution in motive
power. The opinion of this system enter
tanned by ID. K. Clark. whose report
has already been referred to, may be
gathered by the following extract from
that document: 1T means an enormous
commercial success, if properly manip-
ulated, and under Mr.. Fields expert
enced supervision it seems quite pos 4;
sible that this engine will bring about |
the same benefit with regard to the
economical use of steam as Bessemer's |
steel gave to It's own specific indus
tries"