Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-08-20
Protection from Lightning.

1,HE undersigned being the duly appointed Agent Of
SPnATr's ELIcTRIcAN ELECTRO MITALLURGisT LloHT
NNaRop MAsurAcroRr Coyngton, Kentucky, begs to offer
these superior Rods Of 5pratwed Carbopizcd Anneaed
Iron with Zinc Protectors aud Electropoays elements
copper conductors They in eneet lengths with
brassscrew connecting joints an entire
new style Of metallic (patene attachments for brick or
frame budings also, glass isoaters, of novel and inge
nous construction, paienfedD forming lock- the whole
mounted with solid platinum silver point, (paented
twelve long, surrounded at the base with three
lar negative magnets which posss the power TO extra
ordinary extent Of dcharng the opposite elements OF the
most fearful thundcrstorm and embrace perfe
ton Of up the present me the whole constu
ting magnificent and perfect silent conductor
presented 10 the public.
safety has not been compromised by sfordng these
ceent rods at snch low rates. the greatest attention has
The astonishing power Of the negative magnets in dcharg
ing the air of Its opposite elements has been clearly demon
strated by the Elecrometer when unmngnetised 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 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 certificates Have good rods OF
CHARLES W. llEfDON,
Washington City.
chemical reagents to spratts Patent Points for Lightning
Rod and that the results Of these experiments convince
that they Will resist the action Of atmospheric and
thereby preserve the extremity sharpa condition most
senal protection against lightning The reagents used
dunn common sat aetic acid sulphuric acid hydro.
chlorio acid With the FIRST there action the
metal; with the several acids there very qha fact
sufficient show that atmospheric influences would have
no sensible effect.
JOHN LECoNTI, Prof. Of Nat Phil ct Chem.
UNIVERSITY or o., October s, 1850
The Lightning Conductors OF Mr.. spratt offered to
are well calculated perform the Office for which they are
intended Yours, truly, Prof R0BT PETER.
LEXINGTON, KY, February 20, 1850.
CHICAGO, September Z, 1850
This NAV certify that have examined, somewhat cr.
cally James sprnies paont Lightning Rods and that
Of opinion that constructed scieutfc principles For
combining durability, chcapness and efficacy, deem
equal and think SUPERIOR TO any other rod ever offered
for my inspection. Prof JAS V. q. BLANEY.
AUGUSTA, (GA) November II, 1850.
This will certify that have examined the lightning
Rods, Metallic Points, and Isolatng Attachments, manu-
featured BY Mr. Spra and regard them constructed IN
conformity to the general laws Of the electric hud and the
metallic compound constituting the Points as promising
from the result OF tests which they submit
ted to resist for years the action Of hose 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
Of this city, the plan Of Mr. sprat appear 10 mo TO
very well deysed and in point of mechanical
are the best have
Is to be hoped that the Of these Rods may become
which must be regarded Of ordinary magnitude
which ell buildings are liable r. sILIMAN, Jr,
Prof Of Chem. In the University Of Louisville
LOUISVILLE, January ~, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory
Tth street. will be promptly attended to- or at GEoRGI
BELLS Alexandria, Va corner Of King and st. Asaph sta
ap1Ln