ee ee pe ee 
Pao ae eee ee a le Oger 
ia Salar tama ad 
ee Pe gee ane Se ee Cl eT SEO eT EMS See Eee Owe ee a ee ee er amen cee 
Se eye ee ee SE (ped eR PE ee eT EDS ARUN VED TO, Lame eae greene tee eae ee Sy eae aes 
Chemistry and Physics. 65 
In his investigation the author made use of a telephone, which 
is thus seen to es place in acoustic researches. oe il. 
383, 
n the Economy and Subdivision of the wie Light — 
Profesai Farmer of the Torpedo Station at Newport, has written 
the parlor of his house, No. 11 Pearl St., was lighted every even- 
ing during the month of July, 1859, by the electric light, a 
that this electric a a was subdivided, too. Since this was nine- 
teen years ago, s, he thinks, undoubtedly the first private 
dwelling house pe P lighted by electricity ; a fact which may be 
a source of pride to the city of Salem some of these days, As 
now of no one aa qualified to give an opinion on these 
important rT we give the latter portion of Professor 
Farmer’ s lett 
“A galvanic " battery of some three dozen six-gallon jars was 
placed i in the cellar of the house, and it furnished the electric cur- 
pleasure, or both at once, by simply turning a little button to the 
right for a light, to the left for a dark. No matches, no danger, 
no care to the household, nor to anyone except to the man who 
cored » the batte 
son that the acids and zinc consumed in ‘the attery made the 
different Viasohi es, putting a light into each branch. All these 
lamps were supplie ed with electricity from one machine, which did 
not weigh more than eight hundred pounds, and which was driven 
by a oe steam engine. 
word as to the cost of electric light as compared with 
light from gas. Perhaps on the bg one pound of illuminat- 
ing gas will, if burned in an hour in five different burners, give 
thousand to twenty-one thousand units of heat, or the OT teane 
_ of from thirteen to sixteen million foot-pounds ‘of work. Thi is, 
burned in an hour, would average from two hundred to two hun- 
dred and sixty thousand units of work per minute, or say from 
three thousand to thirty-five hundred foot-pounds per minute per 
candle light. 
Now a very large electric light, say ten — candles, 
Am. Jour. Sct an: auc VoL. XVIT , No, 97.—Jan. 
