Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-16
Protection from Lightning.

NHE undersigned, being the duly appointed Agent OF
IL SPRATT's ELECTRICIAN AND ELECTRO LIGHT
NGRoD MAaUFAoToRY Coyingon Kentucky, beg to offer
these superior Rods Of Carbonzed Anneaed
Iron with Zinc Protectors and Retrospective elements
combined manufacture; thus rendering them equal
copper conductors They in tenee lengths with
style Of metallic patented) attachments for brick or
frame budings also, glass solaers Of novel and nge
NOUS construction, patentedO forming lock- the whole
mounted with solid platinum silver point, (patented)
twelve inches long, surrounded at the with three angu
lar negative magnets which the power to a extra
most fearful Thunderstorm embrace the entire perfec
ton of science up TO the present times the whole bonsu
ting the most magnificent and perfect silent conductor
presented to the public
Safety has not been compromised by aording these
ceent such low rates the greatest attention has
been given their construction to be readily attached
The astonishing Of the negative magnets In dischag
ing the air Of its opposite elements has been clearly demon
strated by the Electromeer, when unnagnezed 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 letters pa
tent you hereby cautioned against laying yourselves
LIABLE by purchasing Of those who are not authorized
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods or
CHARLES w. HEYD0N,
La Washington City.
chemical reagents to Spratts Points for Lightning
Rods and that the results of these experiments convince
that they will resist the action of atmospheric and
thereby preserve the extremity sharpa condition
sentia to protection against lightning. The reagents
dun common salt acetc acid suphuric acid and hydro
chlorc acid With the first there action on the
metal with the several acids there very sa 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.. Sprat offered to me-
well calculated to perform the Office for which they
intended. Yours truly, Prof R0BT. PETER.
LEXINGTON, KY, February TO- 1850.
CHICAGO, September g. 1850.
This may certify that have examined, somewhat crit
cay James Spratts Patent Lightning Rods and that
Of opinion that 1t is constructed scientific principles For
combining durability cheapness, and efficacy, deem IT
equal and think SUPERIOR to other rod ever offered
for my inspection. Prof JAS. w BLANEY.
AUGUSTA, (GA.) November H. 1850.
This will certify that l have examined the Lightning
Rods, Metallic Points, and Isoating Attachments, manu-
featured by Mr. pra and regard them as 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
ted resist for years the action of those atmospheric
most likely to corrode them. A. MEANS,
Prof Phys Sc, Emory College, Ca and Prof Chem and
Pharm. Medical College, Ga
The Lightning Conductors put up by Mr. Henry NJ Smith
this city, the plan of Mr. sprat appear to to be
very well devised; and in point of mechanical construction
are the best have seen.
1t is to be hoped that the Of these Rods may become
general important auxiliary defence against danger
which be regarded of ordinary magnitude to
which all buildings are liable. Il. SILIMAN Jr.,
Prof of Chem in the University of Louisville.
LOUISVILLE, January y, 1851.
All orders left ANDREW DUFFY's Stove Mandatory,
7h street, will be promptly attended to; at GEORGE
BELLS Alexandria, Ya corner of King and ST. Asaph sts
APP 14-f