January, 1842, 
1h ao eae SHEET 
OF THE 
AMERICAN JOURNAL OF SCIENCE. 
PHILOSOPHICAL APPARATUS. 
JOSEPH M. WIGHTMAN, 
_ No. 33, Cornumy, Boston, 
| Manufacturer of Fivlgnonhieeds. Mechanten!, and Chemical Appa- 
Among which, a ae for illustrating Inertia, Attraction, 
and other Laws of I 
Mortion.—Laws e Falling Bodies, Compound Motion, Sets for 
Centre of Gravity, Models “of Cycloidal Pendulums, Brachysto- 
chrone, or time of swiftest descent, Law of Central Forces, show- 
ing that bodies in rapid rotation always select the shorter axis, lvory 
and Boxwood Balls for collision. 
9 Mecuantcats.—Complete sets of various sizes, from $25 to 
100. 
Hyprosratic and Hyprautic Apparatus, in great variety. 
Pneumatic.—Lever Air-Pumps, on Leslie’s construction impro- 
~ived. 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 oe en with 
a great variety of Apparatus adapted to different siz 
‘Execrricat PLate Macuines.—Improved coastroetion of all 
sizes. Cylinder do. 6 to 10 inches diameter, Batteries, Jointed and 
Universal Dischargers, Balance, Gold Leaf, and other Electrome- 
ters, Thunder Showers. Cannons, &c. &c. 
Cuemicat. —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 lron with tubes, tight 
joints without Sty Pyrometers, Porcelain Mortars, and Evapora- 
ting Dishes, Nooth’s Apparatus, Bell Glasses, Alembics, tubulated| _ 
and plain ee, Glass Tubes, &c. &c. 
Oprticat.—Lenses, Mirrors, Tighe. Models of the human Eye) 
\Single and Compound Microscopes, Telescopic Kaleidoscope, Phan-| ~ 
