

January, 1843 



ADVERTISING SHEET 



OF THE 





AMERICAN JOURNAL OF SCIENCE 



PHILOSOPHICAL APPARATUS. 



JOSEPH M. WIGHTMAN, 



v No. 33, Cornhill, Boston, 



Manvfacturer of Philosophical, Mechanical, and Chemical Appa- 

 ratus. 



m Among which, are Apparatus for illustrating Inertia, Attraction, 

 and other Laws of Matter. 



Motion. — 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. 



Mechanicals. — Complete sets of various sizes, from $25 to 

 1 00. 



Hydrostatic and Hydraulic Apparatus, in great variety. 



Pneumatic. — 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. 



Electrical Plate Machines. — 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, he. &tc. &c. 



Chemical. — 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. he. 



Optical. — 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, he. &lc 



■PHPPi 



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