1046 SEC. 19. EDUCATIONAL APPLIANCES. 



11. Model of a centrifugal blast. 



12. Model of a draining and drying apparatus. 



13. Apparatus by Coulomb, for causing water to boil by friction. 



14. Syren-disc, playing one accord. 



15. Savart's toothed wheels. 



16. Disc with mirror surfaces and flame-manometer for acoustic 

 flame-images. 



17. Stroboscopic cylinder for demonstrating various oscillations 

 according to Quincke. 



18. Colour-discs. 



19. Oscillating prism. 



20. Glass-balloon for producing Newton's colour-rings in thin 

 metal plates of fluid. 



21. Stroboscopical discs on the systems of Dove,Poggeudorff, &c., 

 illuminated by Geissler's tubes. 



22. Becquerel's phosphoroscope. 



23. Three rotatory tubes by Geissler. 



24. Apparatus for Arago's rotation magnetism. 



25. Apparatus for producing inducted currents in a rotating 

 copper disc, with electro-magnet. 



26. Large wire-spirals for the phenomenon of the earth's in- 

 duction. Emil Stohrer, Leipsic. 



495. Hack and Snail of Clock, to regulate the number of 

 blows struck each hour. The Council of King's College, London. 



496. Model of Chronometer Escapement. 



The Council of King's College, London. 



497. Model of Lever Escapement. 



The Council of King's College, London. 



498. Model of Horizontal Escapement. 



The Council of King's College, London. 



499. Model of Locking Plate of Clock, to regulate the 



number of blows struck each hour. 



The Council of King' s College, London. 



422Oa. Murby's Photo -lithographed Wall Maps (phy- 

 sical). 



World. 

 British Isles. 

 Europe. 

 Central Europe. 



Africa. 

 North America. 

 South 

 Palestine. 



Asia. 



Thomas Murky. 



4220b. Diagrams of Natural History (20). 



Thomas Murky. 



