Daily American telegraph. [volume] (Washington [D.C.]) 1851-1852, 1852-10-04
Protection from lightning.

1870 ~~0~~S
NHE undersigned, being the duly appointed Agent Of
i SpRArTs hEcrRIcAs AND ELECTRO METAILUResr LIGHT
these superior Rods Carbonzed Annealed
Iron, with Zinc Protectors, and Eectroposye elements
combined In their manufacturer thus rendering them equal
copper conductors They In ten-fee lengths with
brassscrew connecting joints an entire
frame buildngs also glass isolaters Of nge-
NOUS construction, paented forming lock; the whole
tho ass
lar negative magnets which possess the to extra
ordinary extent Of the opposite elements of the
most fearful Thunderstorm, and embrace the entire perec
ton Of science up to the present me the whole consu
ting the most magnificent and perfect silent conductor
Safety not compromised by aording these ex-
csleut rods at such low rates. the greatest has
been given to their construction, be readily attached
The astonishing power Of the In dschag
ing the air of Its opposite elements has been clearly demon
strated by the Eectrometer when unmagnetsed 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
These being secured by double letters pa.
tent youre hereby cautioned against laying yourselves
who substituting inferior imtations. All agents duly
appointed can show their csrncatss Have good rods
none. CHARLES w. HEYD0N,
Washington City.
do hereby certify that have app lied various powern
chemical reagents to sprats 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 SHARPE condition most
senta protection against lightning The reagents
u
dium common sal scetc acid suphuric acid hydro.
chloric acid. With the frst there action the
METAL with the several acids there very slga fact
sufficient to show that atmospheric influences would have
sensible effect.
JOHN LEooNTE, Prof. Of Nat Phil etChsm.
UNIVERSITY OF Ga, October 8, 1850.
The Lightning Conductors OF Mr.. spratt offered to me-
we'll calculated to perform the office for which they
LEXINGTON KY., February 20, 1850.
CHICAGO, September 3, 1851
This may certify that have examined, somewhat critt-
cay, James spratts Patent Lightning Rods and that
combining durability, cheapness, and efficacy deem Il
equal and think SUPERIOR to any other rod offered
for my inspection. Prof JAS. V. 2. BLANEY.
AUGUSTA, (GA) November IL, 1850.
This will certify that have examined the Lightning
Rods, Metallic Points and Isolating Attachments,
factured by Mr. Spra and regard them constructed
conformity the general laws Of the electric fluid the
metallic compound constituting the Points promising,
from the result several tests TO which they submit
tod to resist for the action Of those atmospheric
most likely 10 corrode them A. MEANS,
Prof Phys. &c.. Emory College, Ga, and Prof Chem. ana
Pharm, Medical College, Ga.
The Lightning Conductors put by Mr. Henry NJ Smith,
Of this CITY, the plan Of Mr. Spra appear to TO be
very we'll devised and in point Of mechanical construction,
the best have ever seen.
It Is to be hoped that the Of these Rods may become
general important auxiliary defence against danger
which must be regarded Of no ordinary magnitude TO
which ali buildings are liable. r. sIIIMAN, Jr,
Prof Of Chem. In the University Of Louisville.
LOUISVILLE, January q, 1851.
All orders left at ANDREW DUFFYs Stove Mandatory,
7th street, win be promptly attended to; or ut GEORGE
BELLS Alexandria, Vs corner Of King and st. Asaph SITS
ap 14-n