Se aah 
PHILOSOPHICAL APPARATUS. 
JOSEPH M. WIGHTMAN, | 
’ No. 33, Cornurit, Boston, — ae 
Manufacturer of Philosophical, Mechanical, and Chemical Appa- 
ratus. Nee A Ko 
Among which, are Apparatus for illustrating Inertia, Attraction, 
and other Laws of Matter. ;, aan 
Morion.—Laws of Falling Bodies, Compound Motion Sets, for 
Centre of Gravity, Models of Cycloidal Pendulums, Brachysto- 
chrone, or line of swiftest descent, Liaw of Central Forces, show- 
ing that bodies in rapid rotation always select the shorter axis, Ivory © 
and Boxwood Balls for collision. : 
Mecwanicats.—Complete sets of various sizes, from $25 to 
$100. hee : ee x 
-Hyprosratic and Hypravuric Apparatus, in great variety. 
-Pneumati¢.—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. 
Execrrican Prats Macuines.—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. : 
Cuemicay.—Compound Blowpipes, Parabolic Reflectors silver 
plated, in cases with Apparatus, Gas-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 Iron with tubes, tight 
joints without luting, Pyrometers, Porcelain Mortars, and Evapora- 
ting Dishes, Nooth’s Apparatus, Bell Glasses, Alembics, tubulated 
and plain Retorts, Glass Tubes, &c. &c. 
_ Opricat.—Lenses, Mirrors, Prisms, Models of the human Eye, 
Single and Compound Microscopes, Telescopic Kaleidoscope, Phan- 
tasmagoria Lanterns, imported by J. M. W. and warranted superior 
to any other, with great variety of sliders on Astronomy, Natural 
History, Ancient and Modern Costume, Views, &c. &c. 
Astronomy, Grotoey, and Mrerrororoey.—Orreries, Telluri- 
ans, Globes 18, #2, 10, and 6 inches diameter, Clinometers for tak- 
ing the inclination and direction of strata, Reflecting Goniometer, 
Rain Gauges, Barometers and Thermometers. 
Execrro-Macnetism.—A very great variety of Apparatus and 
Machines for Motion, Shocks, and Sparks, for illustrating this, inter- 
esting branch of science. 
Gatvanism.—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. ne 
(> Sets of Apparatus for the various departments of science, are put up for 
Schools, Academies, Colleges, &c. at all prices. Respecting the quality of the 
apparatus manufactured by J. M. W., he has the pleasure of referring to the Edi- 
~ tors of the Journal of Science, and also to the following awards from the Fairs of 
the Mass. Char. Mech. Association held in Boston. SityEr Mepar, 1887. Gop 
Mepat, 1841. Sitver Mepat, 1839. Boston, Dec. 1, 1841. 
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