Daily American telegraph., 1852-06-25
Protection from Lightnine.

yHE undsrsignoi, being the duly appointed Agent Of
SsP ss ! s
these superior Rode Of Carbonized Anneaied
IL thus theme
To copper conductors They in teneet lengths with
brassscrew connecting joints an entire
frame buidngs ALSO glass isoater OF novel and nge
NOUS construction, aented forming lock; the whole
mounted with solid platinum silver point, lpatentedD
twelve inches long at the sewh three angu
lar negative magnets which possess the power to extra
ordinary extent Of dischargng the opposite elements Of the
fearful Thunderstorm and embrace the entire pertec
ton Of science up TO the present times the whole consn
ting the most magnificent and perfect silent conductor
presented to the public ss
Safety has been compromised by afording these
celent such low rates. the greatest attention has
been given their construction, as TO be readily attached
The astonishing power of the negative dischag
ing the air Of its opposite elements has been clearly
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
suspect any being present. t ~. sNfs48
These improvements being secured by double letters
tent you hereby cautioned against laying yourselves
liable by purchasing of those who not authorized OF
who substituting inferior limitations All agents duly
appointed can show their certificates Have la goS4 RODS or
none, CHARLES w, HElDoN,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to Spratts Patent Points for Lightning
that they will the action of atmospheric and
thereby preserve the extremity sharpa condition most
senta to protection against lightning The reagents used
in the above experiments solution of chloride OF
dunn common salt acetc acid, suphuric acid, and hydro
chlorc acid With the first, there action the
metal with the several acids there very a fact
show that atmospheric influences would have
no sensible effect.
JOHN LECoNTE, Prof of Nat Phf ct Chem.
UNIVERSITY OF Ga, October 8, 1850.
The Lightning Conductors Of Mr. Sprat, offered to me,
well calculated to perform the Office for which they are
LEXINGTON KY, February 90 1850
CHICAGO, September 8, 1860
This may certify that have examined, somewhat criti-
cay James spratts Patent Lightning Rods and that
of opinion that it is constructed scientific principles For
combining durability cheapness, and efficacy deem 1t
equal and think SUPERIOR to any other rod ever offered
| for my inspection. Prof JAS. v. q BLANEY. u
| a.. AUGUSTA, (GA) November IL, 1850
This will certify that have examined the lightning
Rods Metallic Points, and Isoating Attachments manu-
actured by Mr. Sprat and regard them constructed in
conformity the general laws of the electric ud and the
metallic compound constituting the Points, as promising
from the result several tests to which they submit
ed resist for years the action Of those
| 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. Sprat appear to me to be
very well deysed and in point of mechanical construction
| are the best have seen.
1t 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. SILIMAN, Jr,
| Prof Of Chem in the University of Louisville.
LOUISVILLE, January 27, 1851.
All orders left at ANDREW DUFFYs Stove Mandatory
7th street. will be promptly attended to; or at GEORGE
BELLS Alexandria, Va corner OF King and st. Asaph SITS
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