Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-05-03

TNHE undersigned being the duly appointed Agent Of
coynsOn Ksntnoa ssu. a os
these superior Rods of Spiral twisted Carbonzed Anneae
Iron, with Zinc Protectors and ElectroPosve elements
copper as conductors They In eneet lengths with
accurately fitted brassscrew connecting JOINTS entire
new style OF metallic (patente attachments for brick
frame buildings also glass isoaters, Of novel and nge
NOUS construction, patented forming lock- the whole
mounted with solid platinum silver point patented
twelve inches long, surrounded at this base with three
lar negative magnets which possess the power TO an extra
ordinary extent OF dischargng the opposite elements OF the
most fearful thunderstorm, and embrace the entire perc
ton of science TO the present time; the whole const
ting the most magnificent and perfect silent conductor
presented TO the public,
safety has not been compromised by aordng these ex
ceent rods at such low rates the greatest attention has
been given to their as to be readily attached
The astonishing power of the negative magnets scharg
ing the air of opposite elements has been clearly demon
strated by the Eectroneter when unmagnetized points
have shown but slight results, though placed under
conditions In fact they gather and silently discharge
electricity from the atmosphere when you would scarcely
These improvements being by double letters pa
tent you hereby cautioned against laying yourselves
liable by purchasing of those who are not authorized or
who are substituting inferior limitations. All agents duly
appointed can show their certificates Have good rods or
none CHARLES w, HEYD0N,
s .a Washington City.
do hereby certify that have app lied various powerful
chemical reagents to 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 the extremity sbarpa condition most
senta to protection against lightning The reagents used
the ABOVE were Cnor1de
dunn common alt acetic acid suphuric acid and hydro
chlorc acid. With the first there was action the
metal with the several acids there very sgha fact
sufficient to show that atmospheric influences would have
no sensible effect. @. t
eyN~r' 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 3, 1850.
This may certify that have examined somewhat crit
cally James spratts Patent Lightning Rods and that
opinion that 1t is constructed scientific principles For
combining durability cheapness, and efficacy, deem it
equal and think superior to any other rod ever offered
for my inspection. Prof JAS. v. 2. BLANEY,
AUGUSTA, (GA.) November H. 1850.
This will certify that have examined the Lightning
Rods Metallic Points, and Isolang Attachments manu-
featured by Mr. Sprat 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
years the action of those atmospheric
most likely to eorrode them. A. MEANS,
Prof Phya Sc, Emory College, Ga, and Prof Chem and
Pharm. Medical College, Ga
The Lightning Conductors put up by Dir Henry NJ. Smith,
of this city, the plan of Mr. Spratt appear to be
very well deved and in point Of anica construction
are the best have
1t is 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. r. sILIMAN, Jr,
Prof of Chem. in the University of Louisville.
LOUISVILLE, January ~, 1851.
All orders left at ANDREW DUFFYs Stove Mandatory,
It'll street, will be promptly attended to- at GEOkGE
BELLS Alexandria, Va of King and St Asaph SITS
ap A-n