6 Advertising Sheet of the 
Philosophical Instruments, Manufactured and Sold| 
BY N.B. & D. CHAMBERLAIN, 
Nos. 2 anp 9 Scuoou Street, Boston. 
Attwood’s Machines, with Second Clocks, Weights, &c. com- 
plete, eight feet high, $25, $50, and #100. Tables with Spring 
‘Pistols, &e. for Compdurid ‘Motion and Forces, $6. Whirling oo 
bles and _—o complete for a variety of experiments, $25 an 
$35 anical Powers, in complete sets, $25, $40, and ren 
Sipdiveiahian aca Hydrostatic Bellows, Hydrostatic Paradox, 
Glass Barrel Lifting ot % Improved Forcing por and 
Stand, with Cisterns, Hose, 
Air Pumps, all ee with the Simple Lever. 
No. 1, eight inch plate, barrel 7 by 2! inches, a No. 2, 
eight inch plate, two barrels 7 by 21 inches, $35. No. 3, twelve) 
inch plate, barrel 11 by 34 inches, has a barometer gauges | $75. 
No. 4,* thirteen inch plate, barrel 13 by 4 inches, $125. No. 5, 
fifteen inch plate, barrel 13 by 44 inches, $150. 
| Bell Glasses are fitted to all the ay sor from half pint 
to fourteen gallons. Prices from 25 cts. 12 
Electrie Machines.—Sixteen inch wdaed with two conductors, 
well proportioned and finished, $25. Twenty four inch plate, with 
two conductors, $40. Twenty eight inch plate, two conductors, 
$50 to $60. Thirty inch plate, two conductors, $75. 
six inch plate, two conductors, $85. Forty inch plate, two con-; 
ductors, $125 to SI wa Fifty five inch plate, two negative con- 
uctors, two pair rubbers, prime conductor 7 feet by 8 inches, 
$400. All the usual redetii of apparatus ACCOMPRRYINE the above 
machines, at fair prices 
micals s.—Cylindrical Gasometers, with Webster’s Improved 
oeapaknd Blowpipe, (Cisterns with Gas Holders, Retorts for Oxy-| 
gen, Lamp Stands, Gas Bags, Pyrometers, &c., remina al Glass; 
all sizes _ me “es 
Galva a war (Sag Apparatus. 
“Working Models of Steam E gives, $35, 60, to $100. See- 
tion Models of Steam Kagines; "B12 10 $18 i a 
| Astronomica Season Machines, Tide Dials, Globes 
information, see Catalogues; 
ptaaet pur u Won4 3 isin ve by Dr Webster, Harvard Universi, one by} 
Ls i eet Unive ae Lege! fale College, 
