Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-06-14
Protection from Lightning.

FHE undersigned, being the duly appointed Agent Of
STRAITS EIEcfRIcAN ELECTRO MEfAILURGIsT LlGHT
NSaRop MANDATORY Coyingon Kentucky begs to oisr
These superior Rods OF Spirawsted Carbonzed Aunealed
caS Win y, l,ao rrotectors ana semsns
a. conductors They In teneet lengths with
BRASS connecting joints, an entire
syie Of metallic patented) attachments, for brick or
frame buildings also, glass solaters of novel and nge
noas constrncon (patentedO forming lock; the whole
mounted WIN solid platinum silver point, (patentedO
twelve inches long surrounded base with three angu
lar which possess the power to extra
ordinary extent OF dschargg the opposite elements of the
most fearful thunderstorm and embrace the entire ner
ton OF science up 70 the present time tho whole constu
ting the most and perfect silent conductor ever
presented to the public. 7f7'
Safety has not been compromised by aording these ex
ceen rods at such low rates. the greatest attention has
been given their construction be readily attached
The astonishing power Of the negative magnets dIschar
ing the air of its opposite elements has been clearly
sated by the Electrometer when unmagnetzed 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 improvements being secured by double letters pa
tent hereby cautioned against laying yourselves
liable, by purchasing of those who not authorized
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods or
none CHARLES w. HEYDoN,
Washington City
do hereby certify that have app lied various powerful
chemical reagents to spras Patent Points for Lightning
Rods that the results of these experiments convince
that they will resist the action of atmospheric and
thereby preserve the extremity sharpa condition most
senai to protection against lightning The reagents used
in the above experiments were solution of chloride of so
dum Common sat acetc acid sulphurc acid and hydro
chloric acid. With the first there action the
meta with the several acids, there very sg-a fact
sufficient to show that atmospheric influences would have
sensible effect.
JOHN LECoNTE, Prof of Nat Phil. ct Chem
UNIVERSITY OF GA, October 8, 1850.
The Lightning Conductors of Mr. Sprat offered to me-
are well calculated perform the Office for which they are
LEXINGTON, KY, February 20, 1860.
CHICAGO, September 3, 1850.
This may certify that have examined somewhat crt
cally James Sprats Patent Lightning Rods, that
Of opinion that constructed scientific principles For
combining durability, cheapness and efficacy, deem 1t
equal and think SUPERIOR to any other rod offered
for my inspection. Prof JAS v. z. BLANEY.
AUGUSTA, (GA.) November H. 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 the general laws of the electric fluid and the
metallic compound constituting the Points promising
from the result several tests to which they submit
ted to resist for years the action of those atmospheric
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 M 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
1t is 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. H. sILIIAN, Jr.,
Prof of Chem in the University of Louisville
LOUISVILLE January q, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory,
BELLS Alexandria, Va, Of King and St Asaph sts
an