Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-08-09
Protection from lightning.

TNHE undersigned being the duly appointed Agent Of
sPRArTs ELECTRICIAN AND ELECTRO MErALuhslsi lAusl
nGRoD MAEURAoFoRr Covngton, Kentucky begs 70 oner
These superior Rods Of spraltwisted, Carbonzed Ahne
IRON with Zine Protectors, and Eectroposuys eemen.
combined In their manufacture; thus rendering theln
70 copper as conductors They in teneet lengths with
connecting joints, an ehure
frame buildings also glass isoater novel and nge-
NOUS construction, aented) forming lock; the whole
twelve inches long at the base with three angu
lar negative magnets which possess the power extra
fearful Thunderstorm embrace the entire perec-
ton of science up to the present time the whole consttu
ting the most magnificent and perfect silent conductor
presented to the public
Safety has been compromised by aording these ex
ceent rods at such low rates. the greatest has
been given their construction to be readily attached
The astonishing of the negative magnets in dscharg
ing the air of its opposite elements has been clearly demon
straed by the Eectromeer, when unmagnetzed points
have shown but slight results though placed under the
same conditions In fact they gather and silently discharge
electricity from the atmosphere when you would scarcely
These being secured by double letters pa
tent are hereby cautioned against laying
liable by purchasing of those who not authorized or
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods or
none. CHARLES w. HEfDoN,
Washington City
do hereby certify that have app lied various powerful
chemical reagents to Spratts Patent Points for Lightning
Rods and that the results these experiments convince me
that they win resist the action of atmospheric causes and
thereby preserve the extremity sharpa condition most
senal protection against lightning The reagents used
the chloride OF
dum common SALT acetc acid sulphurc acid and hydro
chloric acid. With the first there action the
metal; with the several acids, there very sa
sufficient to show that atmospheric influences would have
JOHN LECONTE, Prof of Nat Phil. ct Chem
UNIVERSITY OF Ga, October 8, 1850
The Lightning Conductors of Mr.. sprat offered to me-
well calculated to perform the Office for which they
intended. Yours, truly, Prof ROBT. PETER.
LEXINGTON, KY, February 20, 1850.
CHICAGO, September g. 1850.
This may certify that have examined, somewhat crit
cally James Spratts Patent Lightning Rods and that am
of opinion that is constructed scientific principles For
combining durability cheapness, and efficacy, deem 1t
equal and think SUPERIOR any other rod offered
for my inspection. Prof. JAS. v. a. BLANEY.
AUGUSTA, (GA) November II, 1850.
This will certify that have examined the Lightning
Rods Metallic Points, and Isoating Attachments manu-
featured by Mr. Spra and regard them as constructed in
conformity to the laws of the electric ud and the
metallic compound constituting the Points, promising
from the result of several tests to which they submit
ted resist years the action of those atmospheric
most likely to corrode them. A. MEANS,
Prof Phys &c., Emory College, Ga and Prof Chem and
Pharm., Medical College, Ca
The Lightning Conductors put up by Mr. Henry M. Smith,
of this city, the plan of Mr. Sprat appear to me to be
very well devised; and in point OF mechanical construction
the best have seen.
1t is to be hoped that the Of these Rods 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 q, 1851.
All orders left at ANDREW DUFFYs Stove Mandatory
BELLS Alexandria, Va corner Of King and St. Asaph ss
AMI