Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-08-02
Protection from Lightning.

INHE undersigned being the duly appointed Agent Of
u sPRArTs EIEoRIoAs AND ELECTRO MErALLUReIsT Lear
soRoD MAsUFAcToaY Coyngton, Kentucky, bsgs to oer
THESE superior Rods OF Spatwisted CarboniHed
on, witn Zinc Professors, and Eectropoys eleenss
combined In their manufactures; thus rendering them equal
70 copper as conductors They In tenfeet lengths WIN
lifted connecting joints an entire
new OF metallic lpatented attachments for Drck OF
Frame buildngs also glass isoaters novel and inge
nioas consumption sented forming lock; the whole
twelve inches long surrounded at the base with three angu
lar negative magnets which possess the power extra
most fearful Thunderstorm and embrace the entire perfec
ton OF science up TO the present times the whole consu
presented to the public
Safety has not been compromised by aordng these ex
Ceen rods ut such low rates the greatest attention has
been given their construction be readily attached
The astonishing power OF the negative magnets discharg
ing the air OF its opposite clements has been clearly
stated by the Electrometer 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
These improvements being secured by double leterspa-
tent you hereby cautioned against laying yourselves
liable, by purchasing those who not suthor2ed
who are substituting inferior limitations All agents duly
appointed show their certificates. Have good rods or
none. CHARLES W. HEYDoN,
Washington City
chemical reagents to sprats Patent Points for Lightning
Rods and that the results of these experiments convince
That they viii resist the action of atmospheric and
thereby preserve the extremity sarpa condition
senta 70 protection against lightning The reagents used
dInn Common sat acetc acid suphuric acid and hydro
chorc acid With the first, there no action on the
metal; with the several acids there very sga fact
sufficient to show that atmospheric influences would have
no sensible effect
JOHN LEC0NTE, Prof of Nat Phil OF Chem.
UNIVERSITY OF Ca, October 8, 1850.
The Lightning Conductors Of Mr.. spratt offered to me-
we'll calculated to perform the office for which they
intended. Yours, truly, Prof R0BT PETER.
LEXINGTON, KY. February 20, 1850.
CHICAGO, September o. 1850.
This may certify that have examined, somewhat crti
caiy James Sprats Patent Lightning Rods and that am
opinion that II 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. r. BLANEY.
AUGUSTA, (dA) November Ii, 1850.
This will certify that have examined the Lightning
Rods Metallic Points and Isolating Attachments manu-
by Mr. Spra and regard them constructed in
conformity general laws OF the electric ud and the
metallic compound constituting the Points, az promising
the result of several tests 10 which they submit
resist for years the action OF those atmospheric causes
to corrode them A. MEANS,
Prof Phys. Sc, Emory College, Ga and Prof Chem. and
Pharm., Medical College, Ga.
The Lightning Conductors put by Mr. Henry NJ Smith,
of this city, the plan Of Mr. Spratt appear to be
very devised and In point OF mechanical construction
are the best have
1t IL to be hoped that the Of these Rods may become
general as important auxiliary defence against danger
which must be regarded of ordinary magnitude, to
which all buildings are liable. Il. SILIMAN, Jr.,
Prof of Chem. In the University Of Louisville
LOUISVILLE January q, 1851
All orders left at ANDREW DUFFYs Stove Mandatory,
eth street. will be promptly attended to; at GEORGE
BELLS Alexandria, Va corner OF King and ST. Asaph sts
l4--f