Daily American telegraph., 1852-06-09
Protection from Lightning.

FgNHE undersigned being the duly appointed Agent Of
SPRATTs ELEofRIcAN Observation-Disclosures lheMt-
hiScRoD MANuFAcroRr Covingon kentucky begs 70 oaer
tnese speUor Rods of Spaltwistd, tarbonzed Auhehlsu
Iron, vita Pine Protectors ana Retrospective elements
combhwd ia heir manufacture; thus rendering them equal
10 oope as 1 They In tenfeet lengths with
style of metallic patente attachments for brick
frame buildings Also glass isoaters of novel and nge
NOUS construction (paented forming lock; the whole
mounted with solid platinum silver point (patented)
twelve inches long, at the base with three angu
ordinary extent of dischagng the opposite elements of
most fearful Thunderstorm, and embrace the entire perec
ton of science up the present me the whole constu-
ting the magnificent and perfect silent conductor
presented To the pubic.
safety has not been compromised by aording these ex
ceent at such low rates. the greatest attention has
given their construction AS TO be readily attached
The astonishing power of the negative magnets in discharg
ing the air of its opposite elements has been clearly demon
strated by the Eectrometer when unmagnezed points
have shown but slight results, though placed under the
conditions In fact they gather and silently discharge
electricity from the atmosphere when you would scarcely
suspect any being present.
tent you hereby cautioned against laying yourselves
LIABLE by purchasing of those who not authorized or
who substituting inferior limitations. All agents duly
appointed show their certificates Have good rods or
none. CHARLES w. HEYDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to Spras Patent Points for Lightning
Rods that the results of these experiments convince ME
that they will resist the action of atmospheric and
thereby preserve the extremity sharpa condition most
sentia to protection against lightning The reagents used
in the above experiments solution of chloride of
dunn common salt acec acid sulphurc acid and hydro
chlorc acid With the first, there action the
metal with the several acids, there very sga fact
sufficient to show that atmospheric influences would have
| no sensible effect
JOHN LECoNTE, Prof of Nat. Phil. ct Chem.
| UNIVERSITY OF GA, October s. 1850.
/ The Lightning Conductors of Mr. Spratt offered to me-
we'll calculated to perform the Office for which they
| intended Yours truly, Prof ROBT, PETER,
LExINGToN KY, February 20, 1850
CHICAGO September 8, 1850.
This may certify that have examined somewhat criti-
cally James spatts Patent Lightning Rods and that am
of opinion that il il constructed scientific principles For
combining durability, cheapness, and efficacy, deem 1t
equal and think SUPERIOR to any other rod ever offered
| for my inspection. Prof JAS. V. z. BLANEY.
Augusta, (GA) November IL, 1850.
This will certify that l have examined the lightning
Rods Metallic Points, and Isoating Attachments, manu-
featured by Mr. Sprat and regard them constructed in
conformity to the general laws of the electric ud and the
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 &c., Emory College, Ga and Prof Chem. and
Pharn. 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 devised and in point of mechanical construction
| are the best have
1t be hoped that the of these Rods may become
general important auxiliary defence against danger
which must be regarded of ordinary magnitude, to
| which all buildings are liable. X. SILIMAN. Jr.
Prof of Chem. in the University Of Louisville
| LOUISVILLE, January 81 1851.
AL orders left at ANDREW DUFFYS Stove Mandatory,
nth street, will be promptly attended to- or at GEORGE
BELLS Alexandria, Va of King and ST. Asaph sts
ap lift