Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-08
Protection from Lightning.

TNHE undersigned being the duly appointed Agent Of
M EroTeAS AND Esmtncy SsSs to Offer
These superior Rods of Spiral twisted CarboniIed Anneaeo
combine IL that ana them equal
70 copper a. conductors They in teneet lengths with
brass screw connecting joints an entire
new style OF metallic (patened attachments for brick or
frame buidngs also, glass isolaers novel and inge
NOUS construction SPssented0 forming lock- the whole
mounted with solid platinum silver point patented)
twelve inches long, at the with three ang
lar negative magnets which possess the power to extra
ordinary extent OF dscharng the opposite elements the
most fearful Thunderstorm and embrace the entire perec
ton science up to the present times the whole const
ting the most magnificent and perfect silent conductor ever
Safety has not been compromised by aordna these az
ceen rods at such the greatest attention has
given their construction as to be readily attached
The astonishing power of the negative magnets in dscharg
ing the air opposite elements has been clearly
strated by the Electrometer when unmagnetzed points
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.
tent you hereby cautioned against laying yourselves
LIABLE by purchasing of those who are not authorized or
who are substituting inferior limitations All agents auy
appointed show their certificates Have good rods or
none CHARLES W. HEYD0N,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to sprats Patent Points for Lightning
that they will resist the action of atmospheric causes and
thereby preserve the extremity SHARPE condition most
sena to protection against lightning The reagents used
the above experiments solution of chloride of
dunn common salt acetic acid suphuric acid hydro
chlorc acid With the first, there action the
metal with the several acids there very ga fact
sufficient to show that atmospheric influences would have
JOHN LECoNTE, Prof of Nat Phil ct Chem
UNIVERSITY OF GA, October s, 1850.
The Lightning Conductors of Mr. spratt offered to me,
well calculated perform the Office for which they
intended. Yours truly, Prof. ROBT PETER
LEXINGTON, KY, February co. 1850.
CHICAGO, September 8, 1850
This may certify that have examined, somewhat crt
cay James Spratts Patent Lightning Rods and that
opinion that it is constructed scientific principles For
combining durability cheapness, and efficacy deem it
equal and think SUPERIOR to any other rod offered
for my inspection. Prof JAS. " H. BLANEf. Z
AUGUSTA (GA) November II, 1850. .
This will certify that have examined the Lightning
Rods, Metallic Points, and Isoating Attachments manu-
conformity to the general laws Of the electric ud and the
metallic compound constituting the Points, promising
result of several tests to which they submit
ted resist 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,
this city, the plan of Mr. Spratt appear to to be
very well devised and in point of mechanical construction
are the best have SEEM
It is to be hoped that the of these Rods may become
general 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
It'll street, will be promptly attended to; at GEORGE
BELLS Alexandria, Va, of King and St. Asaph ss
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