Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-10
Protection from Lightning.

TNHE undersigned being the duly appointed Agent OF
NNGRoD MANUpAoToRY Coyngton, Kentucky begs to offer
these superior Rods of Spra CarbonIed Annealeo
Iron, with Znc Protectors aud Eectroposye elements
combined in their manufacture; rendering them equal
70 copper as conductors They In teneet lengths VIII
new s OF metallic (patented attachments for brek or
frame buldnss also glass isoaters Of novel and inge-
NOUS construction, atented) forming lock; the whole
mounted with solid platinum silver point, (patented)
twelve inches long surrounded at the with three
lar negative magnets which possess the power to an extra
ordinary extent Of the opposite elements OF the
most fearful Thunderstorm and embrace entire perfec
ton OF science up to the present times the whole consu
ting the most and perfect silent conductor
presented 10 the public.
Safety not been compromised by aording these OK.
ceent rods ut such low rates. the greatest attention
been given TO their construction To be readily attached
The astonishing power of the negative magnets dscharg
ing the mir OF Its opposite elements, has been clearly
siaed by the Eectrometer when unmagnetized points
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
suspect any being present.
These improvements being secured ny double letters pa
tent you hereby cautioned against laying yourselves
liable by purchasing Of those who are not authorized OF
who substituting inferior limitations All agents duly
appointed can show their Certificates Have COCA ioas OF
none. tliARbiso W. ilbl DoNi
Washington City.
do hereby certify that have app lied various powerful
chemical reagents TO Spratts Patent Points for Lightning
Rods and that the results of these experiments
that they will resist the action atmospheric and
thereby preserve the extremity sharpa condition most
saptia 10 protection against lightning The reagents
in the above experiments solution Of chloride Of 80
dunn Common sat acetc acid suphuric acid and hydro
chlorc acid With the first, there action the
meal with the several acids there very s9h fact
sufficient show that atmospheric influences would have
sensible effect
JOHN LECoNTE, Prof of Nat Phil ct Chem.
UNIVERSITY OF Ga, October 8, 1850.
The Lightning Conductors of Mr. Spratt offered me,
well calculated to perform the Office for which they are
intended. Yours, truly, Prof ROBT PETER.
LEXINGTON, Ky. February 20, 1860
CHICAGO September 3, 1850
This may certify that have examined, somewhat criti
cay James Spratts Patent Lightning Rods and that am
of opinion that is constructed scientific principles For
combining durability, cheapness, and efficacy deem 1t
equal aud think superior to any other rod ever offered
for my inspection Prof JAS, V. n. BLANEY.
AUGUSTA, (GA) November IL, 1850
This will certify that have examined the Lightning
Rods, Metallic Points and 1soating Attachments manu-
facur by Mr. Sprat and regard them as constructed IN
conformity general laws of the electric fluid and the
metallic compound constituting the Points, as promising
the result of several tests to which they submit
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, Ga.
The Lightning Conductors put up by Mr.. Henry NJ. Smith,
Of this city, the plan Of Mr. Spra appear TO to be
very well devised and in point of mechanical construction
the best have seen.
1t is 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.,
Prof of Chem. in the University of Louisville
LOUISVILLE, January y, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory,
7th street, will be promptly attended to- Mt GEORGE
BELLS Alexandria, Va corner of King and St Asaph sts
mp 14-H