PHILOSOPHICAL APPARATUS. 
JOSEPH M. WIGHTMAN, 
No. 33, Cornutt, Boston, ; 
Manufacturer of Philosophical, Mechanical, and Chemical Appa- 
- ratus 
Among which, are Apparatus for illustrating Inertia, Attraction, 
and other Laws of Matter. eet 
Morion.—Laws of Falling Bodies, Compound Motion Sets, for 
Centre of Gravity, Models of Cycloidal Pendulums, Brachysto- 
chrone, or line of swiftest descent, Law of Central Forces, show- 
ing that bodies in rapid rotation always select the shorter axis, Ivory 
and Boxwood Balls for collision. . 
Mecuantcats.—Complete sets of various sizes, from $25 to 
0 ¥ : 
0. : 
Hyprostatic and Hypravric Apparatus, in great variety. 
Pyevmatic.—Lever Air-Pumps, on Leslie’s construction impro- 
ved. . Barrel 4 inches and plate 13 inches diameter; patent Single 
Barrel Lever Air-Pumps, on table stand, and also of portable size 
for Academies; Common Air-Pumps, and Condensing Syringes ; 
with a great variety of Apparatus adapted to the different sizes. 
— Exectricat Prats Macuies.—Improved construction of all 
sizes. Cylinder do. 6 to 10 inches diameter, Batteries, Jointed and 
Universal Dischargers, Balance, Gold Leaf, and other Electrome- 
ters, Thunder Houses, Cannons, &c. &c. &c. com 
Cuemican.—Compound Blowpipes, Parabolic Reflectors silver 
plated, in cases with Apparatus, as-holders, Cast Iron Mercury 
Cistern with Gas-holder, improved from the best English, Lamp 
Stands with improved Shifting Rings, Spirit Lamps with Glass Caps, 
Furnaces of various sizes, Oxygen Retorts of Jron with tubes, tight 
tars, and Evapora~ 
lembics, tubulated 
Models of the human Eye, 
Jescopic Kaleidoscope, Phan- 
°M. W. and warranted superior 
to any other, with great variety ol 
Tie jmaelbue nell Moders Costume, Views, &c. &c. 
Astronomy, Geotocy, and Metrororocy.—Orreries, Telluri- 
ans, Globes 18, 12, 10, and 6 inches diameter, Clinometers for tak- 
ing the inclina 
Rain Gauges, Barometers and Thermometers. 
E.ectro-Maenetism.—A very great variet of Apparatus and 
Machines for Motion, Shocks, and Sparks, for illustrating this inter- 
esting branch of science; fe ee : 
Ganvanism.—Batteries, improved construction of different sizes. 
J. M. W. would refer to his Catalogue for further information, 
copies of which will be sent per mail on application. All letters 
post paid. pe Reo oe eee 
> Sets of, Apparatus for the varions departments of science, are ek up for 
Schools, Academies, Coll . &e. at all prices, Respecting the quality of the 
‘ ing to the Edi- 
the ech. Association held in Boston. Sirver Mepar, 1637. _ Goro 
Boston, Dec. 1, 1841. 
Mxpat, 1841. Smver Mepat, ‘ 
