INDEX TO VOLUME I. 



Adhesion plates, 141 

 Air pumps, 188 

 Air pump receivers, 200 

 Air shower, 211 

 Altitude and azimuth inst. 130 

 Angle meter, 96 



Apparatus for extending the sur- 

 face, 300 

 Apple cutter, 202 

 Architect's scale, 34 

 Archimedes' screw, 240 

 Armillaiy sphere, 107 

 Artificial horizon, 99 

 Astronomical instruments, 101 

 Astronomical telescope, 118 

 Atwood's apparatus, 173 

 Aurora flask, 291 

 Aurora tube, 290 

 Azimuth compass, 54 



Balance beam and cork ball, 213 



Balance electrometer, 262 



Barker's mill, 240 



Battery for plating, 334 



Beam compasses, 26 



Bell in vacuo, 214 



Biot's movable hemispheres, 298 



Bisecting compasses, 24 



Bladder and weights, 208 



Bladder glass, 202 



Bohnenberger's machine, 142 



Bolt head experiment, 203 



Bottle electroscope, 305 



Bow compasses, 20 



Bow compass, universal, 22 



Bow pen, 20 



Bow pencil, 20 



Burnt air, 219 



Bursting squares, 220 



Capillary attraction, 143 

 Capstan, 160 



Centres for draughtsmen, 26 

 Centrifugal hoops, 117 

 Centrifugal pump, 241 

 Centrolinead, 43 

 Chime of bells, 273 

 Chryophorus in vacuo, 218 

 Circular protractor, 43 

 Circumferentor, 60 

 Collision balls, 143 

 Compasses, 15 



Composition of forces, 144 158 

 Condensing apparatus, 198 199 

 Cone and inclined plane, 160 

 Couronne de Jasse, 324 

 Crushed bottle, 220 

 Curves, 40 



Cuthbertson's electrometer, 267 

 Cylinder electrical machines, 252 

 Cylindrical pot battery, 331 



Dancing images, 274 



Dancing pith balls, 276 



Daniell's battery, 332 



Decomposition of water, 340 



Dial with cannon, 136 



Dipping needle, 97 



Directors, 320 



Discharger, 261 



Diverging threads, 277 



Dotting pen, 18 



Double-barrel air-pumps, 192 



194 



Double-bodied vessel, 232 

 Double jar, 301 

 Drawing compasses, 15 

 Drawing pen, 16 

 Drawing squares. 40 

 Dry pile, 306 



Eclipse instrument, 115 

 Electrical air thermometer, 304 

 Electrical aura or breeze, 218 



