MISCELLANEOUS IXSTRUS1ENTS. 273 



APPROVED SET OP 



PHILOSOPHICAL APPARATUS 

 FOR THE SUM OF $150. 



Fig. 150, set of five boxwood balls for collision, $1 5 

 145, pair of glass plates for attraction of cohesion, $1.50 I 

 148, set of tubes for capillary attraction, 50c. ; 123, planeta- 

 rium, $7.50. $10.50. 



Optics. Fig. 731, magic lantern and 12 comic sliders, 

 $8 ; 751, compound microscope, $4; 702, camera obscura ; 

 $3.50 ; 698, prism, $1 ; 699, color blender, $1 ; kaleidoscope, 

 50c. ; set of lenses, If inch diameter, $1.25 ; concave, and 

 convex mirror, 5 in. diameter, $2.25 ; multiplying glass, 50c. 



$22.00. 



Electricity. Fig. 272, electrical machine, with 6 inch 

 cylinder, with knob, two chains, and box of amalgam, $12 : 

 276, Leyden jar, $1.25 ; 277, discharger, $1.25 ; 296, bells, 

 $2.00 ; 300, pair of image plates and pith images, $1.25 ; 

 302, one dozen pith balls, 25c. ; 305, long hair man, 75c. ; 

 315, horsemen, $2.50; 320, swan, 50c. ; 322, syphon and 

 bucket, $1 ; 335, luminous spiral tube, $2. $24.75. 



Pneumatics. Fig. 183, single-barrel air-pump, with bell- 

 receiver, $12 ; 191, hand and bladder-glass combined, 75c. ; 

 211, air shower, 75c. ; 212, mercury cup, 75c. ; 195, pres- 

 sure glass, 75c. ; 197, Magdeburgh hemispheres, $4 ; 200, 

 fountain, $4; 206, bladder and weights, $1.75 ; 218, bell, 

 $2.25. $27.00. 



Hydrostatics, &c. Fig. 248, syphon, 75c. ; 102, spirit 

 level, $1 ; 238, hydrometer, 75c. ; 259, hydrostatic bellows, 

 $5 ; 252, lifting pump, $3. $10.50. 



Galvanism and Magnetism. Fig. 400, Grove's battery, 

 with apparatus for the decomposition of water, charcoal 

 points, &c., $12 ; 391, pot battery, $2.50 ; 424, electro- 

 magnet, $1.50; 426, magic circle, $1.75; 407, powder cup, 



