Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-09-06

TNHE undersigned, being the duly appointed Agent Of
SPIATTs ELECTRICIAN ELECTRO MErALLURdIsT LIdHT-
ROD MANUFAcToRr, Covingon Kentucky begs to offer
these superior Rods spiralwsted Carbonzed Annealed
combined in their manufacturer thus rendering them equal
copper conductors They In teneet lengths with
style of metallic patented attachments for brick
frame buildings ALSO glass solaers Of novel and inge
mounted with solid platinum silver point patented)
twelve inches long, surrounded at the base with three ang
lar negative magnets which the power extra
ordinary exon of schargng the opposite elements Of the
most fearful Thunderstorm, and embrace the entire perc
ton science up the present tmo; the whole consiu
ding the most magnificent and perfect silent conductor ever
presented TO the public.
Safety has been compromised by aording these
ceent rods such low rates. the greatest attention has
been given TO their construction, to be readily attached
The astonishing power Of the negative in dscharg
ing of Its opposite elements clearly
straed by the Eectromeer, when unmngnetized points
have shown but slight results though placed under the
electricity from the atmosphere when you would scarcely
These improvements being secured by double letters pa
tent you hereby cautioned against laying yourselves
who are y subsns nror limitations All asens duy
none. CHARLES w. HEYDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents Sprats Patent Points for Lightning
Rods and that the results Of these experiments convince
that they will resist the action Of atmospheric causes and
thereby preserve the extremity SHARPE condition most
senal 10 protection against lightning The reagents used
in the above experiments solution Of chloride of
ehoric acid. With the FIRST there action the
METAL with the several acids there very sg-a fact
sufficient TO show that atmospheric influences would have
sensible effect.
JOHN LECoNTE, Prof Of Nat. Phil. stChem.
UNIVERSITY OF Ga, October 8, 1850.
The Lightning Conductors of Mr. spratt, offered to me-
well calculated to perform the Office for which they
intended Yours truly, Prof RoBT. PETER.
LrzINGToN KY, February 20, 1850.
CHICAGO, September ., 1850.
This may certify that have examined somewhat crti
ay James Spratts Patent Lightning Rods and that
Of opinion that II is constructed scientific principles For
combining durability rbeapness and efficacy, deem II
tlua and think SUPERIOR to any other rod offered
for my inspection. Prof JAS. v. Y. BLANEY.
AUGUSTA, (GA) November IL 1850.
This will certify that have examined the Lightning
Rods Metallic Points, and Isolatng Attachments,
featured by Mr. sprs and regard them constructed in
conformity to the general laws Of the electric fluid and the
metallic compound constituting the Points, promising
from the result of several tests TO which they submit
ted TO resist for years the action Of those atmospheric
most likely TO corrode them A. MEANS,
Prof Phys Sc, Emory College Ga, and Prof Chem. sna
Phnrm. Medical College, Ga.
The Lightning Conductors put up by Mr. Henry NJ Smith,
Of this city, the plan of Mr. sprat appear to to be
very well deysed and in point Of mechanical construction
the best have
Is to be hoped that the Of these Rods may become
general important auxiliary defence against danger
which be regarded OF ordinary magnitude to
which all buildings liable. X. SILIMAN, Jr,
Prof Of Chem. In the University of Louisville.
LOUISVILLE, January q, 1851
All orders left at ANDREW DUFFYs Stove Mandatory
7h street, will be promptly attended to; at GEORGE
BELLS, Alexandria, Va Of King and St. Asaph
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