ILLUSTRATING ITALIAN SCIENCE. 899 



4566. Photographs of collection of Apparatus formerly 

 belonging to Volta. 



Liceo Volta of Como, Cabinet of Physics and Chemistry, 

 Prof. Giovanni Gambara. 



1. Small voltaic pile. 



2. Small voltaic pile with circle of cups. 



3. Electrophorus. 



4. Two wooden discs covered with silk. 



5. Electroscope. 



6. Apparatus for igniting hydrogen gas by the electric spark. 



7. Glass electrical pistol of Volta. 



8. Eudiometer of the same. 



9. Small squares of zinc and copper for generating electricity. 



10. Glass tube containing mercury, for determining the coefficients of the 

 expansion of air. 



11. Small case made expressly for the protection of the above instruments. 



4567. Photograph of Registering Evaporimeter, ac- 

 cording to the last plan adopted by the inventor, Prof. Ragona. 



Observatory of the Royal University of Modena ; Director, 

 Prof. Domenico Ragona. 



4568. Photographs of Scientific Instruments in the 



Cabinet of Physical Science of the University of Naples. 



Director, Prof. Giuliano Giordano. 



1. Fresnel lens used by Melloni in his researches upon radiant heat, in 

 particular with reference to the heat of the rays of the moon. 



2. Floating plummet, by Paolo Anania de Luca. 



3. A most accurate balance, by Bandini, machinist of the University, 

 resembling that of Steinheil, but much less costly. 



4569. Photographs and Drawings of Scientific Appa- 

 ratus in the Vesuvian arid Meteorological Observatory at Naples. 



Director, Prof. Luigi Palmieri. 



1. Portable seismograph by Palmieri, with a printed description. 



2. Stationary seismograph, made by order of the Hydrographic Depart- 

 ment of the English Admiralty, by Prof. Palmieri. 



3. Stationary seismograph, made for the Vesuvian Observatory. (See 

 explanatory note.) 



4. Anemograph with hydrograph annexed, by Prof. Palmieri, with an 

 illustrated description. 



5. Bifilar electrometer and apparatus, with movable conductor, by the same, 

 with two printed descriptions. 



40 7O. Photographs of Scientific Apparatus. 



University of Pisa; Director, Prof. Riccardo Felici. 



Very ancient thermometer. It is impossible to say whether it works by 

 water or alcohol. For graduation it has a string of glass beads. In the 

 upper part are enamelled the characters, D. 20, A. 25. 



3L 2 



