Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-01
Protection from lightning.

NHE undersigned being the duly appointed agent OF
SPRATrs ELECTRICIAN ELECTRO hETALukslsT Loai-
NsaRop M.suyAcToRY Coyingon Kentucky begs to offer
these superior Rods of Spiraltwsted oIDoIeu Ahneeu
Iron with Zinc Protectors, and Electropotye elements
eombnsS In their thus rendering them equal
To as conductors They are In teneet lengths with
brass connecting joints entire
new tyle Of metallic (patened attachments, for brick
frame budings also glass isolaters OF novel and nge
mounted with solid platinum silver point (patented)
inches long, surrounded at the base with three
lar negative magnets which possess the power extra
most fearful thunderstorm, and embrace the entire perec
ton Of science up to the present time the whole constitu
ting the most magnificent and perfect silent conductor
presented to the public.
Safety has not been compromised by aordng these
ceen such low rates. the greatest attention has
given to their construction TO be readily attached
The astonishing power of the negative magnets in dscha
ing the air Of its opposite elements has been clearly demon
strated by the Eectrometer when unmagnetized 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 being secured by double letters pa
tent hereby cautioned against laying yourselves
LIABLE by purchasing of those who not authorized
who substituting inferior limitations. All agents duly
appointed show their certificates Have good rods
none. CHARLESvW. HEYDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to sprats Patent Points for Lightning
Rods and that results experiments convince me
that they will resist the action Of atmospheric causes
thereby preserve the extremity sharpa condition
senta to protection against lightning The used
in the above experiments were solution of chloride of
dium common SALT acetc acid sulphurc acid and hydro
choric acid With the first, there action the
metal; with the several acids there very sga fact
sufficient to show that atmospheric influences would have
sensible effect
JOHN LECoNTE. Prof of Nat PHI. ct Chem
UNIVERSITY OF Ga, October 8, 1885,
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
cay James Spratts Patent Lightning Rods, and that
of opinion that it is constructed scientific principles For
combining durability cheapness, and efficacy, deem 1t
equal and think SUPERIOR to 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 Isolatng Attachments,
featured by Mr. Sprat and regard them constructed in
conformity the laws of the electric ud and the
metallic compound constituting the Points, promising
the result of several tests to which they submit
ted to resist for the action of those
most likely to corrode them. A. MEANS,
Prof Phys Sc, Emory College, Ga, and Prof Chem and
Pharm., 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 we'll devised and point of mechanical construction
are the best have
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. II. SILIMAN, Jr, s
Prof of Chem. in the University of Louisville.
LOUISVILLE January n, 1851.
All orders left ANDREW DUFFYS Stove Mandatory
18th street. will be promptly attended to; at GEORGE
BELLS Alexandria, Va of King and ST. Asaph sts
ap lift