The herald., 1837-04-29
From the American JoarraI,f science and Ari,.l


cate pendulums and the ringing Of small bells for
long periods OF ume even several years. wiinoat IN
termisslon.
vered, that magn stism evolved between the poles
Of a gavanc battery. Prof Sweiggcr of Halle, Ger
many, 10y he galvanic multiper, succeedcd IN rem
derng the power manifest, when the gavanc battery
was nothing more than two small wires, one u coP
per and the other Of znc Immersed III as inach ar
dulated water contained in a VINE glass. ne
power thus evolved was made TO pass through many
conyouons of insulated wire, and was mus aug
menied as 10 defiect the magnetic needle some
times even 90o. Prof Mol OF Utre.ht by winding
insulated wire around soft iron, impaired 10 i prodl-
sous magnetic powei SO ina. morse snoe oar, mus
provided, and connected with a gasvanlc battery,
would lit oycr one hHndfed pounds About the same
time, Mr. Joseph Henry Of Albany, now Prot Hen
~, Of Princeton College, by new method OF wind
ing the wire, obtained an almost Incredible magnetic
force lifting six seven hundred pounds, with plnt
or two of liquid and battery Of corresponding size;
did he desist until short time after. he Lifted
thousands OF pounds by battery OF larger size, but
still very small, QS30)
This gentleman was not slow to apply his skill 70
The generation Of motion, and successful attempt oi
his IL recorded N this Journal VOL Xxx P. 34o
power was thus applied to the movement Of ma
chine, by beam suspended in the centre, which per-
formed regular vibrations III the manner OF beam OF
a steam engine. This is the original application irom
which have sprang, at least 10 which have sue
ceeded, several similar attempts, both in tins country
and IN Europe. gllyanlc machine was reported 70
the British Association n 1895, by Mr.. Mctiauy, OF
Ireland, and he has renewed his s,atsments OF sue
cessful experiments at the late meeting at Bristol.
Mr.. Sturgeon, of Woolwlch, England also reports
galvanlc machine as beng IN use on his premises Tor
pumping water, and for other mechanical purposes
But | believe that Mr.. Davenport, named at the
head Of this notice, has been successful than any
other person in the discovery OF galvanc machine
OF great simplicity and efficiency. During the last
two or three years much has been said OF thus disco
Very the newspapers, and i is probable, that in
future number Of this Journal, drawings and an accu-
rate description Of The machine may be given. Having
been recently invited 10 examine working model, Y
van3es of form, and 10 report the result shall
now attempt nothing more than general descrip-
ton, such as may render ineligible the account am
10 give.
|. Tie Rotary Machine, composed Of rcroioing
electromagnetic wih fired psrmaReat magnets.
This machino was brought 10 New Haven March
10, 1884, by Mr. Israel Slade, of Troy y. Y. and by
n m set IN motion fJr my examination. The moving
part comp0s sed OF two iron bars placed horizontally
aud crossing each other al right angles. They are
both five and half inches long and they arc tcrm
mated at each end by q segment Of circle made 81
soft ron; these segments each three inches long
IN the chord line, and their position, as they arc sns
pended upon the ends Of the iron bars, i horizontal.
THIS iron cross IS sustained by a vlrtical ak :,
standing with its pvotln socket, and admitting oi
easy rotation. The IRON cross bars are wound with
copper wire, covered by Gotten, and they made TO
ioIm, AT pleasure, proper connexion with small
circular battery made OF cOncentrc cylenders OF cop
per and zinc, which can be immersed in quart OF
aclduaied water. Two semicrcles Of strongly mag
nCzed steel form an entire circle interrupted only Il
the Two opposite poles, and within this circle watch
les horizontally, the galvanized IRON cross moves IN
such manner that lis segments revolve paral-
III and very near 10 the magnetic circle and IN the
same plane. Is 0ys at ITS upper end, - fitted by
horizontal cog-whee 10 another tnd larger vertical
wheel, 70 waose horizontal axis, Weights attached
and ralsci by the winding Of a rope. As soon as the
small battery, destined 10 generate the power, Is
properly connected with the machine and duly ex-
cited by diluted acld the mot on begins, by the nor,
zon,a movement of tbs iron cross, with lis circalar
lly tho gnly
these crosses and their connected segments are mag
ne,ized acquiring north and south polarity a. their
opposite ends asd beng tnus subjected - the attract
inc and rcpelhng tor,e Of the circular fixed magnets
a rapid horizontal movement Is produced, al the rate
of two hundred u three hundred revolutions IN M
nute when the small battery used, and over SIX
hsndred with n caoEmotor Of large size. The rope
was wound up with a weight Of fourteen pounds al
achcd, and twcuty-eigh pounds were lifted from the
floor. The movement II instantly stopped by break
ng The cOnncxon with the battery, and then rovers
cd by simply in'ercnanging the connexlon o. the
wires ol the battery with those Of the machine when
Il becomes equally rapid IN the opposite direction.
The machine, philosophical instrument ope-
rates with beautiful aud ssrprslng elect and rca-
son can bc discovered why the motion may not be
indefinitely coniiaued II ) easy 70 cause very gra-
dual flow Of the impaired exhausted acid liquor
from and II fresh acdalaied water nto the rcceps-
ca Of the battery, and whenever se metal Of the lat
ter Is too much cOrroded 10 be any longer efficient,
another battery may be instantly substituted, and
that even before tho cOnncXon ~ the old battery -
broken A. TO the energy Of the power II becomes at
oncca mlst Interesting nqalfy, whether II admits 81
indefinite increase 10 tss inquiry Il may be replied,
that provided the magnetism of both the revolving
cross and the xsl citcls can bc ndciaely lncrcas.
cd, then appears why the energy oi the pow
er cannot also be indefinitely increased. Now, az
magnets OF the common kind, usually called pcfma.
non magnets, find their limits within, al most, the
power OF hftng few hundred pounds Il y obvious
that the revolving gai,an'c magnc: must, m IT, cicI-
oncy, be limited by its relation 10 the fixed magnet.
But il i important fact discovered by experience,
that the latter IL soon impaired power by the IN
auence of the revolving galvanc magnet, which -
easy made 70 surpass u IN energy, and ,hysas were
10 oyerpowor IT, l u obvlods therefore that the fix
,d magnet as well the revolving, ought 10 bc mag
nezed by galvcnism, and then there every reason
10 believe that the relative equality of the two and of
course their relative energy may be permanently sup
ported and even carried 10 m extent much greater
than has been hitherto attained.
q Rotating Micaiu,, composed entirely qfe',c,r0-
magnets both ia IL fired and rerofring membcrs.
machine Of this construction has been, this day,
March ~ 1887 exhibited 10 mo by Mr. Thomas Da-
yennort himself who came from New York 10 New
Haven foI that purpoe.
II e the same machine that has already been dee
crbed cxcept that the exterior fixed circle now com
pissed entirely of felecro-magncts.
The entire apparaHs IS therefore constructed ~ soft
unmagnetic iron, which being properly wound with
insulated copper wire, is magnlllzcd ~ an instant ~
Ill