Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-05-10
Protection from Lightning.

NHE undersigned, being the duly appointed Agent Of
NaRoD MANuFAcToRI, Covington Kentucky, begs TO offer
these superior Rods Of prawisted Carbonized Anneaed
Iron with Zinc Protectors and Eeetroposive elements
combined in their manufacturer thus rendering them equal
copper conductors They in tenet lengths with
connecting joints an entire
frame bldings also glass isoaters, Of novel and inge
NOUS construction, alented forming lock; the whole
mounted with solid platinum silver point, (paented)
twelve inches long surrounded at the base with three
lar negative magnets which possess the power to extra
ordinary extent OF dscharng the opposite elements OF the
most fearful Thunderstorm, and embrace the entire perc
ton Of science up to the time the whole constu
ting the most and perfect silent conductor ever
SAFETY has not been compromised by aordng these ex.
cent rods at such low the greatest attention has
been given to their construction to be readily attached
The astonishing of the negative magnets in dscharg
ing the air Of its opposite emen has been clearly demon
sraed by the Elecrometer, when unmagnetized 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 -
These mprov being secured by double letters pa,
tent YOU are hereby cautioned against laying yourselves
LIABLE by purchasing Of those who not authorized
who are substituting inferior limitations All agents duly
appointed can show their Have good rods or
h "r.@ssaf .g"t tg MA 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
that they will resist the action Of causes ana
enal TO protection against lightning The Reagents used
In the above experiments solution OF chloride of
diu, common sat acetc acid, suphnrc acid and hydro
choric acid With the first, there action the
metal; with the several acids there very sa fact
sufficient to show that atmospheric influences would have
JOHN LECoNTE. Prof Of Nat Phil ct Chem
UNIVERSITY OF GA, October 8, 1850.
The Lightning Conductors Of Mr. Spratt, offered to
well calculated to perform the office for which they
intended. Yours, truly, Prof ROBT PETER
LEXINGTON, KY. February 20, 1850 .ar..
CHICAGO, September 8, 1850
This may certify that have examined, somewhat cr
cally James Sprats Patent Lightning Rods and that
Of opinion that 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. v. 2. BLANEY
AUGUSTA, (GA) November II, 1850.
This will certify that have examined the Lightning
Rods Metallic Points, and Isolating Attachments
featured by Mr. Spra and regard them constructed in
conformity the general laws of the electric fluid and the
metallic compound constituting the Points promising,
the result of several tests which they We're submit
ted to resist for 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. Sprat appear to me % be
very well devised and in point of mechanical construction
the best have seen.
1t is to be hoped that the Of these Rods may become
general important auxiliary defence against danger
which be regarded of ordinary magnitude to
which all buildings are liable r. SIL1MAN, Jr., ="
Prof of Chem. in the University of Louisville.
LOUISVILLE, January q, 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 SITS
ap lift