Daily American telegraph., 1852-05-15

| VsHE undersigned being the duly appointed Agent OF
il SPRArrs EIEcTRIcAS AND ELECTRO LIGHT
MAsUrAcToRr covngton, Kentucky bsgs 70 oies
these superior Rods Of Carooned Annesed
combined IN their manufctue thus rendering them equal
copper conductors They are in teneet lengths with
new syle of metallic patented attachments, for brick
frame buildings also glass solaters OF novel and nge
mounted with solid platinum silver point (patented)
twelve long surrounded at the with three
Ordinary extent Of dscharng the opposite elements Of the
most fearful thunderstorm and embrace the entire perec-
ton of science up to the present tme the whole consu
ting the most and perfect silent conductor ever
presented TO the public.
Safety has not been compromised by afording
eent rods at such low rates. the greatest attention has
been given to their be readily attached
The astonishing power OF the negative magnets in dschar
ing e AR OF It's opposite clements has been clearly Demon
strated by the Rlectrometer when unmagnezed points
have shown but slight results though placed under the
electricity from the atmosphere when you would scarcely
suspect any being present.
These improvements being secured by double letters pa
tent you are hereby cautioned against laying yourselves
liable by purchasing Of those who are not auhorize or
who substituting inferior limitations All agents duly
none CHARLES w. HEYDON,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents spratts Patent Points for Lightning
Rods the results of these experiments convince
that they will resist the action of atmospheric causes and
thereby preserve the extremity sharpa condition most
sena protection against lightning The reagents used
in experiments solution of chloride of
dunn common SALT acetc acid suphurc acid hydro
choric acid. With the FIRST there action the
meta with the several acids there very sgta fact
sufficient to show that atmospheric influences would have
sensible effect.
JOHN LECONTE. Prof Of Nat PHI ct Chem
UNIVERSITY OF GA, October s, 1850
The Lightning Conductors of Mr.. sprat offered to me-
intended Yours truly, Prof ROBT PETER
LEXINGTON, KY, February 90 1850.
CHICAGO, September 3, 1850
This may certify that have examined, somewhat cri-
cay James Sprats Patent Lightning Rods and that
Of opinion that it 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. " z. BLANEY.
AUGUSTA, (GA) November IL, 1850
This will certify that have examined the Lightning
Rods, Metallic Points, and Isoating Attachments
featured by Mr. Sprat and regard them constructed in
conformity to the general laws of the electric fluid and the
metallic compound constituting the Points, as promising
from the result Of several tests to which they submit
ted to resist for the action of those 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. Spratt appear to be
very well devised and in point of mechanical construction
are the best have SEEN "A;
is to be hoped that the these Rods may become
which must be regarded OF ordinary magnitude, to
which all buildings are liable. Il. SILIMAN, Jr. Ct
Prof of Chem. in the University of Louisville.
LOUISVILLE, January n, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory
It'll street, will be promptly attended to- at GEORGE
BELLS Alexandria, Va of King and St. Asaph sts
up 1Atf