Daily American telegraph., 1852-07-28
Protection from Lightning.

rNHE undsrsigned being the duly appointed Agent OF
SPRArr's EIEcrRIcAE ELECTRO MErALURGisr LIGHT
NNGRoD MAsURAcroRY Coyngton, Kentucky begs to offer
these superior Rods Of Spiral twisted CarboniIed Anneaeo
eam5 wn met and them eaus
70 copper as conductors They in teneet lengths with
lifted brsssserew connecting joints an entire
new style q metallic lpatened attachments for brck OF
frame budings also, glass solaters, of novel and inge
NOUS constrncton, pstented0 forming lock- the whole
mounted with solid platinum silver point (patented)
twelve inches long base with three angu
lar negative magnets which the power to extra
fearful Thunderstorm and embrace the entire perc
ton of science to the present tme the consttu
ting the most magnificent and perfect silent conductor
presented to the public.
Safety has not been compromised by aording these ex
ceen rods such low rates. the greatest attention has
been given their 80 as to be readily attached
The astonishing power Of the negative magnets in discharg
ing the air Of its opposite elements mas been clearly demon
have shown but slight results though placed under the
conditions In fact they gather and silently discharge
electricity from the atmosphere when you woud scarcely
These improvements being secured by double letters
tent you hereby cautioned against laying yourselves
LIABLE by purchasing of those who not authorized or
who substituting inferior limitations All agents duly
appointed can show their certificates Have good rods OF
none CHARLES W. HEiDoN,
Washington City.
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 causes, and
thereby preserve the extremity sharpa condition most
senal protection against lightning The reagents used
dun, common acetic acid sulphurc acid, and hydro
chloric acid. With the first there action the
meta with tho several acids, there very sla fact
sufficient to show that atmospheric influences would have
no sensible effect.
JOHN LECoNTE, Prof of Nat. Phil. 81 Chem.
UNIVERSITY Ga. October s. 1850.
The Lightning Conductors of Mr. Spratt offered to me,
are well calculated perform the Office for which they
intended. Yours, truly, Prot kOBT. PETER.
LEXINGTON, KY, February 20, 1850.
CHICAGO, September s, 1860
This may certify that have examined somewhat crit-
cally James Sprats Patent Lightning Rods, and that
combining durability, cheapness and efficacy, deem it
equal and think superior, to any other rod ever offered
for my inspection. Prof JAS. v. u. BLANEY.
AUGUSTA, (GA) November II, 1850
This will certify that have examined the Lightning
Rods Metallic Points, and Isolating Attachments manu-
featured by Mr. Spra and regard them constructed in
conformity the laws of the electric ud and the
metallic compound constituting the Points, promising
from the result Of several which they submit
ted to resist for years the action OF those causes
most likely to corrode them A. MEANS,
Prof Phys. &c.. Emory College, Ga. and Prof Chem. and
Pharm., Medical College, Ga.
Tho Lightning Conductors put up by Mr. Henry NJ Smith,
of this city, the plan of Mr. Spra appear to to be
well devised and in point Of mechanical construction
are the best have
is be hoped that the of these Rods may become
general important auxiliary defence against danger
which must be regarded of ordinary magnitude, to
which all buildings are liable. Il. SILIMAN, Jr.,
Prof of Chem. in the University of Louisville
LOUISVILLE, January Y, 1851.
All orders left at ANDREW DUFFYS Stove Mandatory,
It'll street. will be promptly attended to- or ut GEORGE
BELLS Alexandria, Va Of King and st. Asapf sts
ap lift