Omaha daily bee., 1889-01-23

az utNl ultClllS.
Dynamo Engineering.
Electrical Review: One of the prob
lens which soon presented themselves
in regard to the application of the mo-
tive power to dynamos was the question,
how to do away with the complication
of shafting and betting and connect the
dynamo axle directly tothat of the driv-
ing steam engine.
1t was found out in the early days of
the dynamo (which, Notwithstanding its
prosperous growth, is still in its baby
hood that the rapidity of its revolution
is a most important factor in its effect
i%vcness, as this increases in proportion
as the velocity OF those parts of the
armature which receives the inductive
influence cut the lines of force mans
ing from the magnetic pole-picces
of the field. 1t was, therefore,
evident that in order to OBJ
tain an available connection
between the aXles of driving engine
and dynamo. either the steam engine
must be so constructed as to enable it
to produce an unusually great number
of revolutions (sa y 600 or more per
minute), or the size of the armature
must be largely increased, so as to in
crease the velocity of its periphery,
which, of course, is always in direct
ratio to its diameter. A siX-fOld in
crease in size of the armature will be
| electrically equivalent to a siX-fold in
| crease of the velocity of the steam en-
CINE.
In this country we have tried TO solve
the problem by the aforementioned de-
vice, namely, RAPIDLY moving engines.
One of the first of this kind was devised
by Captain Ericsson. h made the
working drawings for an engine and
dynamo revolving on the same shaft,
for the Delamater works, West Four
teenth street and Tenth avenue, where
it was built aud has been kept in opera
ton for some years.. 1t operates with
oscillating cylinders, makes from 500 to
1000 revolutions per minute, feeds some
eight or ten arc lights in the foundry,
and occupies no more room than the
well known coal boxes, familiar to all
New Workers as an appendage to the
corner groceries, in fact, 1t is inclosed
in a similar box, the local necessities
not allowing it TO occupy more room.
In Germany the inventive genius ap-
pears to have worked on the other track
mentioned, namely, increase OF the
diameter of the armature. The first
machines of this class were built by
G~uelcher. of Biela, who, by quadrupling
the diameter of the armature, reduced
the necessary number of revolutions
from 600 per minute to less than one
fourth OF this amount.
Combined Gas and Electric FIXTURES.
Light. Heat and Power: Lighting
fixtures, arranged for the use of gas or
electricity, or Of the two i'll combina-
tion, are not novelties in the abstract,
but those who give details in such mat
tiers little attention are not aware of the
,,rnnrnSs hninp mazda in the 1pD1rtlHnnt
of fixture manufacturing.
In recent specifications for lighting
supplies sent out from the treasury de-
partmcnt ut Washington we notice fea~
lures that are new TO us, and show that
time and skill are being expended in
this direction TO a greater extent than
is generally supposed. The variety and
ncwnes of the devices shown and upon
which bids are asked proves that the
government has become a strong con-
vert to the dual system Of Lighting,
while many Of the designs are SO pat
termed as to evidence that the gas
lighting parts of the fixtures are in
tended for more than ornament.
Among the designs new to us are sew
eral upon the we'll known Lungren com
bination plan, excepting that, whlle the
Lungren lamp is the central pendant,
the surrounding lesser light are mean
ucScenJ eltCJFlCb, ll5JCdu W Wv uohhl
ga Jets. The effect, so ar rs Il be
determined from the sketches shown,
must be good, and the suggestion Of
such "A combination contains excellent
matter for development. We are pleased
TO find such designs emanating from so
substantial "a source rs the national
treasury. Expenditure in this direction
is n sensible method Of reducing that
much-talked-of surplus.
In connection with this, we have re-
Gently seer a iXture-of the first Of pro-
badly many in the same direction
combining the Lungren and the Wells
bach, upOu the Same plan ms that above
mentioned, excepting that the fixture,
emanating from the manufacturers OF
the first named lamp, IL more essentially
a Lungren fixture than the other. This
design is attractive and satisfactory in
results.
Is not the way to which these devices
and kindred Ones point broad enough
for ma ny to follow? Is there not n pro-
tit for gas companies in giving more at
tention TO these matters, not perhaps so
much in direct income from the sale OF
the fixtures, as in causing the consumer
TO look TO the gas company for new de-
velopments in methods OF using, as well
as for simply furnishing materials for
lightY
Before ten years have passed, gas
managers will look back upon to-day
and wonder how they could have Oeen
SO slow. ...