1028 SEC. 19. EDUCATIONAL APPLIANCES. 



Anvil. 

 Crushing mortar. 



with base. 



Blowpipe hammer. 



Triple lens. 



Single lens. 



Coddington lens. 



Magnetic and electric needle in case. 



chisel. 

 Berlin porcelain cups. 

 Brass spirit bottle. 

 Griffin pastille mould, boxwood, and 



two stampers. 

 Griffin pastille mould, iron. 

 Support for sublimator. 



Charcoal block and support. 



Colour plate and support. 



B. P. cup and wire holdei. 1 . 



Cupel support and two cupels. 



Set of three watch glasses. 



Bunsen's burner and blowpipe jet. 



Box powdered glass. 



Brass stand. 



Wooden blocks. 



Set of 100 minerals. 



Glass case for do. 



Set of 100 blowpipe minerals. 



6 Von Kobell's minerals. 



120 fragments minerals. 



9 Mohr's degree of hardness. 



4O92c. *' Educational Series." Physical and Chemical 

 Apparatus. J. J. Griffin $ Sons. 



Voltaic Electricity and Magnetism. 



Thermo-electric Pile, simple form, for school use. 



Thermo-electric Pile, very delicate, for investigations. 



Galvanometer, vertical needle, simple, for school use. 



Galvanometer, astatic, delicate, for use with thermo-piles. 



Galvanometer, astatic, for lecturers, with long needle. 



Astatic needle, simplest form, on support for demonstration. 



Tangent Galvanometer, working model of. 



Solenoid, single, with soft iron core, to explain electro-magnets. 



Sole?wid,AovLble, with soft iron core, to explain induced currents and induc- 

 tion coils. 



Pair of Induction Planes, copper wires coiled on a plane to exhibit induced 

 currents. 



Induction Coil, school form, to give shocks. 



Ruhmkorfps Induction Coil, with Grove's battery. 



Ruhmkorjfs Induction Coil, with Bunsen's battery. 



Rheostat, for interposing known resistances. 



Electrolysis of water, Buffs apparatus, delivering the gases separately. 



Smee's Galvanic Battery. 



Model of Cannon, fired by electricity. 



Faraday's Needle, rotating round a current parallel to itself. 



Barlow's Stellar Wheel, rotating between the poles of a magnet. 



Sturgeon's Copper Disc, rotating between the poles of a magnet. 



De la Rive's Floating Battery, carrying a magnetic solenoid. 



Electro-magnetic set of Apparatus, to exhibit the experiments of Faraday, 

 Ampere, Ritchie, Sfc. 



Electro-magnetic Machine, with Siemens' Armature, for heating wires, firing 

 fuses, decomposing water, &c. 



Horse-shoe Magnet, large and powerful, for use on lecture table. 



Bar Magnet, suspended in cradle for lecture demonstrations. 



Dipping Needle with universal motion. 



Ritchie's Rotating Magnet, simplest form. 



Soft-iron Discs, Stars, Rods, Sfc., for illustrating magnetic induction. 



Hydrostatics and Hydraulics. 



Pascal's Apparatus, proving that the pressure depends on the height of the 

 column and the area of the base, and not upon the capacity of the vessels. 



