Daily American telegraph., 1852-06-12
Protection from Lightning.

rINHE undersigned being the duly appointed Agent Of
Il sPRArrs ELECTRICIAN AND ELEorRoMErALLUheiSf LIGHT
HGRoD MAHuPAcroRY Coyngton, Kentucky pegs 70 oner
these superior Rods Of Sprawised Carbonized Anneaed
Iron with Zinc Protectors aud Elecroposihye elements
combined In their manufacturer thus rendering them equal
to copper conductors They tenet lengths, with
brassscrew connecting joints an entire
frame buildngs also glass isoaters, Of novel inge
NOUS construction, atented forming lock; the whole
twelve inches long, the base with three sngu
lar negative magnets which possess the power extra
ordinary extent Of dischargng the opposite elements of the
ton of science up TO the present tme the whole consu
ting the most magnificent and perfect silent conductor
presented to the public.
Safety has not compromised by aording these ex
ceent rods at such low rates. the greatest attention has
been given their construction to be readily
The astonishing power of the negative magnets In dischar
ing the air its opposite elements has been clearly demon
srated 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
These being secured by double letters pa
tent you hereby cautioned against laying yourselves
table, by purchasing of those who not authorized or
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods or
none. CHARLES w. HEYDON,
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 convince
thereby preserve the extremity harpa condition most es
sentia protection against lightning The reagents used
the above experiments OF chloride
dunn common sat acetic acid, suphuric acid and hydro
chlorc acid With the first, there action the
metal with the several acids there very S-a
sufficient show that atmospheric influences would have
no sensible effect.
JOHN LECoNTE, Prof of Nat Phil ct Chem
| UNIVERSITY OF GA, October 8, 1850.
The Lightning Conductors of Mr. Spratt, offered to me,
well calculated to perform the office for which they
intended Yours truly, Prof. k0BT PETER.
| LEXINGTON KY, February co. 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 on 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. q BLANEY.
AUGUSTA (GA) November IL, 1860
| This will certify that l have examined the Lightning
Rods Metallic Points, and Isoating Attachments manu-
featured by Mr. Spra and regard them constructed IN
conformity the general laws of the electric hud and the
metallic compound constituting the Points, promising
from the result of several tests to which they submit
ted to resist for 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, Ca
The Lightning Conductors put up by Mr.. Henry NJ. Smith
of this city, the plan of Mr. Sprat appear to to be
very well deved and in point of mechanical construction
| are the best have
1t is to be hoped that the of these Rods become
general important auxiliary defence against danger
which be regarded Of ordinary magnitude, to
| which all buildings are liable. r. SILIMAN, Jr.,
| Prof Of Chem in the University of Louisville
LOUISVILLE. January q, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory
7th street. will be promptly attended to- at GEORGE
BELLS Alexandria, Va corner OF King and St. Asaph SITS
ap 14-tf