Daily American telegraph., 1852-07-22
Protection from Lightnine.

INHE undersigned being the duly appointed Agent Of
ENsRoD MANDATORY Coyngton, Kentucky, begs to offer
these superior Rods ofspatwisted Carbonized Anneaed
IRON with Zinc Protectors, and Eectroposive elements
combined In their manufacture; thus rendering them equa
70 copper as conductors They In tenet lengths, with
brassscrew connecting joints, entire
new syle o. metallic patentsd attachments for brick or
frame buildngs also glass isoaters of novel and nge
NOUS construction, atented) forming lock; the whole
twelve inches long, surrounded at the base with three angu
lar negative magnets which possess power to extra
most fearful Thunderstorm, embrace the entire perfec
ton Of science up to the present me the whole cons
ting the most and perfect silent conductor
presented TO the public
Safety has not been compromised by aordng these ex
ceent rods at such low rates. the greatest attention has
been given their construction be readily attached
The astonishing Of the negative magnets in dischar
ing the air Of Its opposite elements has been clearly demon
strated by the Eectromeer, when unmagnetzed 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 are hereby cautioned against laying yourselves
LIABLE by purchasing of those who not authorized
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 sprats Patent Points Lightning
and that the results Of these experiments convince
thereby preserve the extremity sharpa condition
senta to protection against lightning The reagents used
dum Common acetic acid sulphurc acid and hydro
chloc acid With the first there was no action on the
metal with the several acids there very slg-a fact
sufficient to show that atmospheric influences would have
no sensible effect.
JOHN LECoNTE, Prof of Nat. PHI. ct Chem.
UNIVERSITY OF GA, 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 ROBT. PETER.
LEXINGTON, KY, February 90, 1850.
CHICAGO, September 8, 1850.
This may certify that have examined somewhat criti
cay, James Spratts Patent Lightning Rods, and that
Of opinion that it is constructed scientific principles For
combining durability cheapness and efficacy, deem it
equal and think SUPERIOR to other rod offered
for my inspection. Prof JAS. " 2. BLANEY.
AUGUSTA, (GA.) November IL, 1850.
This win certify that have examined the Lightning
Rods, Metallic Points and Isolating Attachments,
facured Mr. Sprat and regard them constructed in
conformity to the general laws of the electric uid 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, 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. Spratt appear to to
very well devised and in point of mechanical construction
are the best have
1t is to be hoped that the of these Rods become
general as an important auxiliary defence against danger
which must be regarded of ordinary magnitude to
which all buildings are liable. r. SILIMAN, Jr,
Prof. of Chem. in the University Of Louisville.
LOUISVILLE, January n, 1851.
All orders left at ANDREW DUFFY'S Stove Mandatory,
7th street, will be promptly attended to; at GEORGE
BELLS Alexandria, Va of King and ST. Asaph sts
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