Richmond dispatch. [volume] (Richmond, Va.) 1884-1903, 1884-09-07
THE oREATDYEAMOs.
Some cfth Most Remarkable Objects ut the
Electrical Exhibition.

| IHE 0hE1I III HdMVO.
Some OF the Most Remarkable Objects nj the
| Electrical Exhibition.
philadelphia Press.I
The Electrical Exhibition attracted large
number OF visitors Yesterday. During The
morning and afternoon the attendance was
! light. but The throng made lis apoearmcs
when the last rays OF the sun had given
Mace TO darkness, aud the grea. reflector
| on the top OF the building cast n
broad river of dazzling light over
the roofs and chimneys between the
building and the new City HILL. That
immense pile OF granite was bathed in
brightness by the powerful agency Of the
mammoth reflector. MANY exhibits have
not vet been arranged. and the building re-
sounds with the hustle OF workmen and
the din Of hammer and saw, but for all that
the exhibition does not bear an air OF in.
completeness. for tlc displays already ia
place are numerous, attract We. and Won
/ deriuI. Wheels revolye, organs play, deli.
cate mecbaulsms are operated, lights
burn, and the building is illuninated
! with pale electric spleudor that Outyies
| the CHEEKY sunlight in is dazzling
| brightness. All this is produced 10y the
| mysterious, invisible agent, which Tusnes
| through the tiny wires and is generated
| away back in the north end OF the struc-
ture by nlmberlcss dynamos OF wonderful
capacity, which silently but steadily create
a motive power. Nightfall is the signal for
n supreme effort 10 outriyal The ,...erb Of
| day.', Springs and cranks are tonc1at.
| and in an instant the immense structure Il
ahiaze with Hight from a thousand lamps.
The scene then is glittering and weird. An
shadows are banished, and the cn.ire block
is lighter than Gay.
RDIsON's EXHIBITS.
The Edison Company has ten Of these
wonderful machines. which have an agsrc-
gate capacity OF several thousand lishss.
These are all In active Use The most note
worthy Of the lot Is the immense "Jumbo"
dynamo. II is OF $50 horsepower. and
lights 800 lamps in the leciurs-rOom OF The
depot anGeX. II is an immense mass OF
solid iron, whose weight would aggrc-
gate perhaps twenty-five tons. II hls
two "bobbins" and a cylindrical "drmS-
ture." The latter is the device upon
which the wires TO which the hu.d /,
first communicated is arranged. Tue M.
ton Of the armature generates the electric
current from the two immense magnets b.
side il measured seven feet In heigh, by "a
many broad. The armliurc l. thirty
inches in circumference and six feet long.
The machine is very simple in rs exterior
construction. Were il placed right side
up it would LOOK like two bro11.
heavy plates of IRON. four feet eich
way. connected 10y the bobbin,. which
in shape are like obiong stOycpipes.
The base OF the structure is painted =
lead color. bui when the tremendous motor
is working NJ full speed the fricliDn j. so
intense that the surface l. covered win \
half inch of iron dust. The arm1tIrc r.
wolves Ut d rate OF $50 revolutions minute.
while the smaller ones make from 800 10
1,S00. Then il j. that watches are som
times magnelized in an instant by prOXuni-
~ 10 the dynamo. They act as though bee
wiiched. lose OF gain time. and i'm many
eases stop. Then they have 10 be depolaf-
lied by expensive methods. Such was the
magnetism OF the big machine yesicrdlv
that Electrician Edgar picked UP a large
hammer, stru X TIE easing Of The mag
net, and immediately the heavy instrument
chung tcnaciously 20 the mass Of iron.
Then he threw a handful ~ rails DT0mi>cu-
Ousy al it. They also adhered, nor could
they be removed by the fingers. When The
engine was stopped. the nails ratified - the
floor. The Jumbo Is the most powerful
dynamo ever constructed. In front OF
Jumbo stood a stout man, in a dark ir)ck
coat; his face was smooth shaved and b)rs
Il look OF interest as hc gIZcd at the mt
cbinery. The man was Thomas A. Edison.
The great electrician looked like a country
parsOn.
THE OTHER DYNANOS.
Nax-f ora tI. -pifa1 Gtaf.- Cnrnn,nt-f5
Ten dynamos, the largest OF which is 600.
light power. Two supply current for l0)
hia l~mps in multipie "rc. They are dif.
fercnt IN construction and ncdtcr in ap.
pearance than the Edison make. The
largest does not weigh as much as the re-
yolving cylinder OF the latter, and the en-
tire machine would not tip the beam above
three tons. II has four bohbins or reels OF
wire. These are placed horizontally in
stead OF Eerpendicularly, rs in the Edison.
The 200-light machine is peculiar, BY The
touch Of spring 1919 OF those lights could
be instantly eXtinPui,hed. while the 2og.h
would continue to burn brightly. This
can be done with no other dynamo.
The Brush Company has good display
Of machines for producing electric full.
Their armatures are made Of wrousht-irOn
ribbons, while MI others are OF cast irol.
This enables it to give more light with less
power. The most notable OF their exhibit
il the ten and twenty ampier machine.
By merely moving 4 wooden block
at the end the supply OF electricity
is diminished or increased ten am
piers. In other words. il the dynamo
was adjusted at a power Of 1000 can
die lights 1t could, at will. be in
stantly increased TO 1000 candle lights.
This is done by contriyanee which splits
tie current OF fluid in two. The Brush
dynamo il a neat machine with four mag
nets Instead of two. The armalurc Is
whee-like, and alsO contains thu bobbins
through which the fluid flows when first
generated. The llrger ones are about six
feet long and q yard high.
The Ball Company IA, a dynamo peculiar
and distinct from all Others, aud em5odle-
an entirely different invention. The arma-
turc l. reyolved before the single pole %
magnet instead OF between two, as IN the
Edison, Brush, and United States. TIE
electrician said that "in discovering the
new method we have found more power
with less propelling force necessary. Tha.
fOrty-fye Hight dynamo only requires 4
motive force Of between eighteen and TWEEN
ty horsepower, whereas other mixers allot
to each light the propeliing force Of one
horse. 1t is easy TO run, ana, owing 10 au-
tomato oil cans, man can start IL and then
20 10 sleep.
The dynamos OF the Thomson-Ho
Company are cylindrical III shape. with 4
small spherical armaure. This gives the
least possible air resistance. aud makes a
great saving III horsepower. 1t i the
most compact Of any OF the dynam0s eX-
IL IL