Daily American telegraph., 1852-11-17
Protection from Lightning.


TIME undersigned, being the duly appointed Agens
1 SpRATTs ELEcrRIcaa ELECTRO METAILUnGrsT LI6t
these suneor Rods Of Carhoniaed Innened
Iron with Zinc Protectors and Retrospective elements
combined In their manufactured thus rendering them equal
copper conductors. They In ten feet lengths with
accurateyed brassscrow connecting Joints, entire
style of metallic patentedl attachments for brick
frame buliings ALSO glass isoaters Of novel and inge
NOUS construction, (patented forming lock; the whole
mounted with solid platinum silver point lpatentsd
twelve inches long, at the base with three angu
lar negative magnets which possess the power
ordinary extent fschargng the opposite elements OF the
most fearful thunderstorm nnd embrace the entire perfec
ton science up to the present tme the whole consit
ting the most magnificent and perfect silent conductor
presented to the public.
safety has not been compromised by aordng these ex
eent rods at such low rues the greatest attention has
been given to as to be readily attached
The astonishing power of the IN discharg
srsed BY the thermometer when unmagnetiaed points
have shown but slight results, though placed under the
conditions IN fact they gather and silently discharge
electricity from the atmosphere whom you would scarcely
These being by double letters pa
tent you hereby cautioned against laying yourselves
who substituting inferior limitations. All agents duly
appointed show their cercateR Have good rods or
none. CHARLES W. HEIUOa,
|. Washington City.
do hereby certify that have app lied various powerful
chemical reagents to spratts Patent Points for Lightning
Rods that the results these experiments convince
that they win resist the acon Of atmospheric causes and
thereby preserve the extremity sharpa condition most
senta protection against lightning The reagents
the above experiments solution Of chloride Of so
dum common SALT acetic acid suphuric acid and hydro
chlorc acid. With the first, there action the
etal with the several acids there very gha fact
sufficient to show that atmopheric influences would have
sensible effect.
JOHNLEooNTE, Prof. Of Nat Phil stchem.
UNIVERSITY OF GA, October 8, 1907
The Lightning Conductors OF Mr. spratt, offered to me-
well calculated TO perform the Office for which they ara
intended Yours truly, Prof koBf. PETER.
LEXINGTON, Ky, February 20, 1850
1850 CHICAGO September 5, 1s5OI
This may certify that have examined, somewhat crit
cay James sprats Patent Lightning Rods and that
Of opinion that Il Is constructed scientific principles For
combining durability, cheapness, and efficacy deem IL
equal and think superior, TO any other rod offered
for my inspection Prof. JAS. V. 2. BLANEY.
AUausfA, (GA) November IL, 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 uid and the
metallic compound constituting the Points promising,
result several tests 70 which they submit
resist for years the action Of those
most likely to corrode them A. MEANS,
Prof Phys. &c. Emory Coege Ga. and Prof Chem. ana
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 10 be
very well devised and in point Of mechanical construction
are the best have ever seen.
II to hoped that the Of these Rods may become
general important auxiliary defence against danger
which must be regarded Of no ordinary magnitude, TO
which all buildings are liable. r. sILIMAN, Jr.,
Prof OF Chem. IN the University OF Louisville
LOUISVILLE, January y, 1851.
All orders left at ANDREW DUFFY's Stove Manufaetorf,
eth street. will be promptly attended to; at GEohGE
BELLS Alexandria, Va corner Of King and st. Asaph rts
pl4-f