Q 



INDEX. 



Ampere's Stand . . 

 Astatic Needles . . 

 Aurora Borealis Apparatus 

 Aurora Flask . . 



34 

 39 

 12 

 12 



Batteries, various . 14, 15, 22, 23, 35 

 Battery Cells . . . .19 

 Bells, Set of Chimes . . .12 

 Bells, Electric . . -42, 43 

 Bells, Telephone Call . . 4 1 



Bertch Machine .... 8 

 Binding Screws . . . .20 

 Biot's Apparatus . . . .12 

 Brass Balls . * . . . - 13 

 Brass Chains . . . 13 

 Brass Clamps . . . J 3 

 Brass Conductors . . . . 13 

 Breguet's Telegraph . . .38 

 Breguet and Crossley's Telegraph 38 

 Bucket and Syphon . . .13 

 Butterfly Net . . . .12 



Carbon Blocks . . . 20, 21 



Carbon Blocks and Holders . 26 

 Cat Skins ..... 5 



Cement, Electrical . . . 13 



Coils, Medical . . . .22 



Coils, Intensity . . . .24 



Commutators . . . .21 

 Compasses ..... 39 



Contact Breakers . . . .21 



Cooke's Telephone Alarum . .41 



Copper Wire . . . .21 



Cylinders, Glass . . . . 13 



Cylinder Machines, various . . 8 



Daniell's Batteries 

 Dipping Needles . 

 Dischargers . 

 Door Triggers 



Ebonite Discs . . . -14 

 Ebonite, -Rods of. . . .5 



Egg Stand 13 



Electric Bells and Fittings . 42, 43 

 Electric Clocks . . . .31 

 Electric Light Apparatus . . 26 

 Electric Thermometers . . -45 



Electrolysis 36 



Electro-Magnet . . . .31 

 Electrometers, or Electroscopes II, 12 

 Electro-Motive Models . 32, 34 

 Electrophorus, Gutta-percha Base 5 

 Electrophorus, Resin Plate . . 5 

 Electrophorus, Volta's ... 5 

 Electro- Plating, Sundries for . 25 

 Electrotype Apparatus . . . 25 



Faraday's Butterfly Net 



Faraday's Rotating Needle . 



Figure Plates 



Fire Alarms .... 



Floating Battery . 



Frictional Electricity, Sets for 



Fulminating Pane 



Gaiffe's Batteries . 



Gai fife's Electric Lamp . 



Galvanometers 



Gas Lighters, Electric . 



Geissler's Tubes . 



Glass Handles 



Glass Rods .... 



Gramme's Dynamo Machine 



Grove's Batteries . 



Gutta-percha Tissue 



15, 1 6 Hand, Spiral 



. 39 Head of Hair 



II, 34 Hitter's Apparatus 



. 45 Holtz and Bertch Machine 



, 



12 



35 

 13 

 45 

 35 

 9 

 U 



22 

 26 

 32 



45 

 24 

 14 



i4 



26 



13 

 13 



35 



