Daily American telegraph., 1852-04-24
Protection from Lightning.

TINE undersigned being the duly appointed Agent of
SPRATTs ELECTRICIAN AND ELECTRO LIGHT
ROD MANDATORY Covington Kentucky, begs to offer
these superior Rods of Spirtwsed Carbonzed Annealed
combined in their manufactured thus rendering them equal
to copper as conductors They in tenee lengths with
accurately fitted brass screw connecting Joints an entire
style of metallic paented attachments, for brick
frame buildings also, glass olaers, of novel and nge
NOUS construction, (patened0 forming lock- the whole
mounted with solid platinum silver point (patented,)
twelve inches long, surrounded at the three ang
lar negative magnets which the power to extra
fearful Thunderstorm and embrace the entire perc-
ton of science up TO the present time the whole consttu-
ting the most magnificent and perfect silent conductor
presented to the public.
Safety has not been compromised by aording these
ceen rods at such low rates. the greatest attention has
been given as to be readily attached
The astonishing power of the negative magnets in dscharg
atrated by the Elecrometer, when unmagnezed 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
suspect any being present
These being secured by double letters pa
tent you hereby cautioned against laying yourselves
table, by purchasing Of those who not authorized
who substituting inferior limitations All agents duly
appointed show their certificates Have good rods
none. CHARLES W. HEYDoN,
Washington City.
do hereby certify that have app lied various powerful
chemical reagents to spras Patent Points for Lightning
Rods and that the results of these experiments convince
that they will resist the action OF atmospheric and
thereby preserve the extremity sharpa condition most
sental TO protection against lightning The reagents used
dunn, common sa acec acid sulphurc acd and hydro
choric acid. With the first, there action tho
metal with the several acids, there very sgh-a fact
sufficient to show that atmospheric influences would have
sensible effect.
JOHN LECoNTE, Prof Of Nat Phil. ct Chem
UNIVERSITY OF Ga October s, 1850.
The Lightning Conductors of tIr eprat offered to me-
we'll calculated to perform the office for which they
intended. Yours, truly, Prof R0BT. PETER.
LExINeroH, KY, February 20, 1850.
CHICAGO, September s. 1850.
This may certify that have examined somewhat crt
cally James spratts Patent Lightning Rods and that
combining durability, cheapness and efficacy, deem it
equal and think superior, to other rod ever offered
for my inspection. Prof JAS " 2. BLANEY.
AUGUSTA, (GA) November IL, 1850.
This will certify that have examined the Lightning
Rods Metallic Points, and Isolang Attachments,
featured by Mr. Spra and regard them constructed in
conformity to the general laws of the electric uid and the
metallic compound constituting the Points, 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. Sc, Emory College, Ga, and Prof Chem and
Pberm., Medical College, Ga.
The Lightning Conductors put up by Mr. Henry NJ Smith,
Of this city, the plan Of Mr. Sprat appear to DO
very well devised and in point Of mechanical construction
are the best have
1t is to be hoped that the of these Rods become
general important auxiliary defence against danger
which must be regarded of ordinary magnitude to
which all buildings are liable. X. SILIMAN, Jr,
Prof of Chem. in the University of Louisville.
LOUISVILLE, January q, 1851
All orders left at ANDREW DUTFYs Stove Mandatory,
eth street, will he promptly attended to- or at GEORGE
BELLS Alexandria, Va, Of King and ST. Asaph SITS
mp lift