192 



Physical Apparatus for Projection. 



s. (1. 



21.562. idem, graduated in Vao" 18 1. 0. 



21.563. 3 Small Thermometers with various liquids 0. 10. 



21.564. Andrews' Press for the compression and 

 liquefaction of carbonic acid gas .... 2. 0. 



21.565. Apparatus for critical temperature phe- 

 nomena 0. 5. 6 



21.566. Sectional Model of a steam cylinder . . 2. 0. 



21.567. Apparatus for conduction of heat in metal 



rods 0. 10. 



40.774. Apparatus for demonstrating the different 

 thermal conduction of copper, lead and 

 wood 0. 13. 



21.568. Apparatus for demonstrating the decrease 

 in temperature produced by removing the 

 source of heat 0. 15. 



21.569. Gypsum Slab for showing the elliptical 

 propagation of heat in crystal? 0. 5. 



21.570. Small Flat Flask for filling with carbon 

 disulphide and iodine . 0. 1. 9 



21.571. Plane-parallel Vessel for solution of alum 0. 11. 



21.572. do., entirely of glass 0. 6. 



21.573. Device for the absorption of heat rays by 

 coloured glasses 0. 17. 



Magnetism and Electricity. 



s. d. 



21.574. Apparatus for demonstrating magnetic 

 distribution in bar magnets 1. 16. 



21.575. 2 Small Magnets for producing lines of 



force i 0. 3. 6 



21.576. 1 Set apparatus for explaining the theory 

 of the magnetic lines of force (as suggested 



by Berghoff) 3. 10. 



21.577. Declination Needle 0. 7. 6 



21.578. Dip Needle 1. 2. 



41.150. Russner Magnetic Pendulum 7. 10. 



41.151. -- do., for setting up on optical bench . 6. 5. 



21.579. Aluminium Leaf Electroscope (von Beetz's) 1. 2.0 



21.580. Kolbe's Aluminium Electrometer .... 3. 0. 

 21.581 21,583. Accessories to aluminium electro- 

 meter 0. 16. 



29,003 29,006. Further accessories to the alu- 

 minium electrometer 1. 6. 6 



40,015. Grimsehl's Aluminium Leaf Electrometer 3. 10. 

 40,01640,018 and 40,02140,023. Accessories. 1. 18. 



40.019. Graphite Conductor for demonstrating drop 



of potential 1. 10. 



40.020. do., graduated 1. 17. 



Absolute Electrometer (for lecture pur- 

 poses), Braun's, for projection, see p. 963 



and 1155. 



Volts 1500 01500 3500 



Graduated from 100 100 500 500 100 100 volts 



2.18.0 2.7.0 3.2.0 

 idem: 



Volts 3500 10,000 



Graduated from 500 500 500 500 volts 

 2. 10. 3. 11. 



B (1. 



21.584. Pile Electrometer 3. 5. n 



21.585. do., with open piles 3. 15. o 



29,936. Pendulum Electrometer (Weinhold's) . . 4. 5. 



29,936 a. Water Chest for above 0. 6. n 



28.692. Electrometer for investigating radio-active 

 substances 4. 0. o 



28.693. Curie Electrometer 6. 0. 



28.694. -- do., with reading microscope (for 

 illustration see No. 29,871) 7. 1<. o 



29,022. Simple Projection Cell (Kolbe's) .... 0. 3. o 



28,691 a. Kolbe Double Projection Cell 0. 6. o 



21.586. Vertical Galvanoscope 1. 0. 



21.587. Vertical Galvanometer 1. 13. 



21.588. Small Galvanometer for the horizontal 



projection apparatus 3. 6. 



Demonstration of the hot-wire measuring 

 instrument (as suggested by Scotti) . . . 1. 5. ( 



21.589. Moving Coil Projection Galvanometer . . 4. 0. 

 41,203. Moving Coil Galvanometer for demonstration 



and projection purposes 8. 0. n 



21.590. Apparatus for showing the heating effect 



of the electric current 0. 10. d 



21.591. Water Decomposing Apparatus 0. 8. n 



21.592. Apparatus for electric endosmose .... 0. 10. (I 



21.593. Apparatus for objectively demonstrating 

 electrolytic decompositions and crystallisa- 

 tion 0. 11. d 



21.594. Saturn's Tree for above 0. 4. o 



21.595. Projection Trough with auxiliary for 

 capillarity phenomena, communicating 

 tubes, electrolytic phenomena, lines of 



force, etc , 4. o. o 



21.596. Apparatus for demonstrating the migra- 

 tion of a drop of mercury through the 

 electrolytically-produced inequality of the 

 surface tension (for illustration, see re 



Xo. 29,174) 0. 7. d 



21.597. Capillary Galvanoscope (Weinhold's) . . 0. 9. o 



21.598. Electro-magnet (Weinhold's) 2. 0. 



21.599. Apparatus (as suggested by Topler) for 



the production of magnetic curves ... 1. 2. 



21.600. Apparatus for the rotation of liquid con- 

 ductors 0. 10. o 



21.601. Apparatus for showing damping by in- 

 duction 0. 1C. i) 



21.602. Apparatus for demonstration of the flow 



of current in 3-phase conductors .... 1. 0. d 



21.603. Electro-thermal Apparatus as suggested 



by Schumann 1. 13. o 



Miscellaneous. 



s. d 



21.604. International Clock !.().( 



21.605. Rotatory Star Chart 1. 13. 



28,695. 10 Movable Photographs relating to 



Astronomy 0. 0. 



