Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-08-17
Protection from Lightning.

VHE undersigned, being the duly appointed Agent "
SPRArr's ELECTRICIAN ann METAILuRorsr LI0Hr
NaRoD MANUFAcroRr Covngton, Kentucky begs to offer
these superior Rods Of Carbonixed Annsasd
Iron with Zinc Protectors, and Eectropositvs elements
combined In their manufacture; thus rendering them equal
to copper conductors They in teneet lengths, with
style Of metallic (patented attachments for brick Or
frame budings also, glass isoaters, of novel and ings
nous construction, (patented forming lock- the whole
mounted with solid platinum silver point (patsntsd
twelve inches long, surrounded at the base with three anu
lar negative magnets which possess the power, extra
ordinary extent dschargng the opposite elements Of the
most fearful Thunderstorm and embrace the entire perfe
ting the most magncen and perfect silent conductor ever
Safety has not been compromised by aHordng these
ceent rods at such low rates the greatest attention has
been given to their TO DO readily attached
The astonishing power Of the negative magnets In dchar
ing the air of Its opposite elements has been clearly demon
strated by the Electrometcr when unmagnetzed points
have shown but slight results though placed under the
conditions In fact oy gather and silently discharge
electricity nom the atmosphere when you would scarcely
suspect any being present.
tent are hereby cautioned against laying
iabs by purchasing Of thoss who are not or
none. CHARLES w. HEYDON,
Washington City.
do hereby certify that have app lied various powerful
Chemical to pasn. lor
that they will resist the action of atmospheric causes and
thereby preserve the extremity sharp condition most es
in the above experiments solution Of chloride Of
dium common sa acetc acid sulphurc acid and hydro
choric acd. With the rst there no action on the
metal with the several acids, there very sg-a fact
sufficient to show that atmospheric influences would have
no sensible effect
JoHNLECONTE Prof Of Nat. Phil. ct Chem.
I UNIVERSITY OF Ga. October 8, 1850.
The Lightning Conductors Of Mr. spratt, offered to me-
well calculated perform the Office for which they
intended. Yours, truly Prof RODT. PETER.
LEXINGTON, KY, February 20, 1850.
CHICAGO, September 3, 1850.
This may certify that have examined somewhat crt
cslly James Sprats Patent Lightning Rods and that am
of opinion that 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. " 2. BLANEY.
AUGUSTA, (GA) November IL, 1850.
This will certify that have examined the Lightning
Rods Metallic Points, and Isolatng Attachments manu-
facured by Mr. Spra and regard them constructed in
conformity the general laws of the electric uid and the
result Of several tests to which they submit
to resist for years the action of those atmospheric
most likely to corrode them. A. MEANS,
Prof Phys. &c.. Emory College, Ga, and Prof Chem and
Pharm, Medical College, Ga.
The Lightning Conductors put up by Mr. Henry Smith,
Of this city, the plan of Mr. Spra appear to to be
very well DEVISED point of mechanical construction
tho best have
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. r. SILIMAN, Jr.
Prof Of Chem. in the University of Louisville.
LOUISVILLE, January q, 1851.
All orders left at ANDREW DUFFYs Stove Mandatory,
BELLS Alexandria, Ya of King and st. Asaph sts
an 14-tf