Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-05-06
Protection from Lightning.

rIHE undersigned, being the duly appointed Agent Of
NNcRoD MANDATORY Covngton, Kentucky, begs offer
these superior Rods Of spraLtwisted Carbonzed Annealed
Iron, with Zine Protectors and Electroposve elements
combined their manufacturer thus rendering them equal
to copper conductors They In eneet lengths with
accurately brassscrew connecting joints an entire
new style Of metallic patened attachments for brick or
frame buildings also, glass isolaters, of novel and inge
nious construction, patented forming lock- the whole
mounted with solid platinum silver point, atented,)
twelve inches long, surrounded at the base with three
lar negative magnets which possess the power to extra
ordinary extent OF dschnrgng the opposite elements the
most fearful Thunderstorm and embrace the entire perec-
ton of science to the present tme the whole constt
ting the most magnificent and perfect silent conductor
presented to tho public.
Safety has not been compromised by aordng these ex
coent rods ut such low rates the greatest attention
been given TO their to be readily attached
The astonishing of the negative magnets charg
ing the air Of opposite elements has been clearly demon
sraed by the Electrometer when unmagnetized points
have shown but slight results, though placed under
conditions In fact they gather and silently discharge
electricity from the atmosphere when you would scarcely
suspect any being present. a ,-g.t Y. is.t,.E II
These being secured by double letters pa.
tent, you hereby cautioned against laying yourselves
liable by purchasing of those who not authorized
who substituting inferior limitations. All agents duly
nome nerS''s'A '''" ''' - cmaRIEs W. mEyDoS, ' .
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to sprat Patent Points Lightning
Rods and that the results of these experiments convince
that they will resist the action Of atmospheric causes and
thereby preserve the extremity sarp-a condition most
enal to protection against lightning The reagents used
oI ol
dunn common sal acec acid suphuric acid, and hydro
chloric acid. With the first, there action the
meta with the several acids, there sLga fact
sufficient to show that atmospheric influences would have
sensible effect.
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 to perform the Office for which they
intended Yours, truly, Prof ROBT. PETER.
LEXINGTON, Kr., February 20, 1850.
CHICAGO, September 8, 1850.
This may certify that have examined somewhat criti
cay, James Spratts Patent Lightning Rods, and that
combining durability cheapness, and efficacy, deem it
equal and think SUPERIOR to any other rod offered
for my inspection. Prof JAS V. 2. BLANEY.
AUGUSTA, (GA.) November IL 1850.
This will certify that have examined the Lightning
Rods, Metallic Points, and Isolating Attachments,
featured by Mr. Spratt and regard them 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
tcd to resist for the action Of those atmospheric
most likely TO corrode them. A. MEANS,
Prof Phys Sc. 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. Spratt appear to be
well devised and in point Of mechanical construction
are the best have seen.
1t to be hoped that the of these Rods become
general, important auxiliary defence agars danger
which must be regarded of ordinary magnitude
which all buildings are liable. X. SIIIMAN, Jr,
Prof Of Chem, in the University Of Louisville.
LOUISVILLE, January q, 1851.
All orders left at ANDREW DUfFY'S Stove Mandatory
7h street, will be promptly attended to; at GEORGE
BELLS, Alexandria, Va Of King and st. Asaph s
apI LIT