MISCELLANEOUS. 1081 



(15.) 1. Large APPARATUS for POLARISATION, made by Soleil. 



2. Apparatus by Norremberg. 



3. Apparatus for polarisation, Biot. 



4. Apparatus for polarisation, Arago. 



5. Cianopolarimeter, Arago. 



6. Apparatus for polarisation, by Malus. 



7. Saccharometer, by Soleil. 



8. Phosphoroscope, by Becquerel. 



(16.) 1. ATMOSPHERIC THERMOMETER, by Jolly, made at Monaco, 



2. Apparatus by Clement and Desormes. 



3. Mercury calorimeter, by Favre and Silbermann. 



4. Complete apparatus of Melloni, made by Ruhmkorff. 



(17.) Working model of stationary STEAM ENGINE. 



(18.) 1. COMPASS, by Prazmowsky, for measuring the intensity 

 of the horizontal components of terrestrial magnetism. 



2. Compass for declination. 



3. Magnetic theodolite, of Lament, made at Monaco. This 

 instrument is portable, and serves to determine all the magnetic 

 constants. 



4. Apparatus, Faraday's, for diamagnetism. 



(19.) 1. Large ELECTRIC MACHINE, by Winter, with two discs. 

 Made at Vienna. 



2. Machine, Holtz's, of the second kind, with horizontal discs. 

 Made at the Tecnomanasi of Milan. 



3. Double machine, PoggeridorfPs. Made at Berlin. 



(20.) HOLTZ'S MACHINE, of the first kind, worked by a wheel. 



It was used in this way by Prof. Rossetti to measure the amount of work 

 employed to produce a current of given intensity, and for other experiments 

 described in his memoir " Nuovi Studii sulle Correnti delle Macchine Elettriche" 

 (Atti dell' Istituto Veneto, Vol. III., Ser. IV., 1874 ; Nuovo Cimento, 

 Vol. XII., 1874. Ann. de Chim. et de Phys. T. IV. 1875., Journal de 

 Physique, 1875). 



(21) 1. RHEOTONU of Breguet and Masson. 



2. Sine compass. 



3. Tangent compass. 



4. Thermometer, Riess's. 



5. Reometric Balance, Bernardi's. 



A magnetic needle, working upon horizontal pivots, 'is surrounded by a 

 frame, on which is wound a wire, and is united in action with the yoke of a 

 sensitive balance. The intensity of the current traversing the wire is measured 

 by the weight that must be placed in one of the scales of the balance, in 

 order that the beam, and consequently the needle, may rest horizontally. 



6. Galvanometer (vertical) for instruction. 



7. Galvanometer of Du Bois Reymond, made by Sauerwald. 



8. Torsion galvanometer. 



40075. 3 Z 



