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INDEX OF CATEGORIES

ELECTRICITY
1 CYLINDRICAL CONDUCTOR WITH ELECTRIC PENDULUMS
2 ELECTRIC CARILLON
3 CAVENDISH-BECCARIA ELECTRIC HOLLOW GLOBE
4 LIGHTNING-CONDUCTORS
5 LEYDEN JARS
6 BATTERY OF NINE LEYDEN JARS
7 LUMINOUS LEYDEN JAR
8 LANE'S MICROMETRICAL SPARK GAP WITH LEYDEN JAR
9 FRANKLIN'S BATTERY
10 EPINOUS'S CONDENSER
11 DISCHARGER
12 DISCHARGER
13 ELECTROSTATIC DISCHARGER WITH DOUBLE FORK
14 MASCART'S INSULATORS
15 VOLTA'S PISTOL
16 VOLTA'S PISTOL (2 PIECES)
17 PITH-BALL AND GOLD LEAF ELECTROSCOPES
18 BOHNENBERGER'S ELECTROSCOPE
19 BOHNENBERGER'S ELECTROSCOPE
20 PELTIER'S ATMOSPHERIC ELECTROMETER
21 PELTIER'S ATMOSPHERIC ELECTROMETER
22 HENLY'S ELECTROMETER
23 ELECTROSTATIC BALANCE
24 THOMSON-MASCART'S QUADRANT ELECTROMETER
25 WINTER'S PLATE ELECTRICAL MACHINE
26 ACCESSORIES OF THE WINTER'S MACHINE
27 SPIRAL FULMINATING TUBE
28 HOLTZ'S ELECTROSTATIC INFLUENCE MACHINE
29 ELECTROSTATIC MACHINE WITH SELF-EXCITATION TOPLER-VOSS
30 POTASSIUM BICHROMATE ELECTROCHEMICAL CELLS
31 NOBILI'S PORTABLE GALVANOMETER
32 ASTATIC GALVANOMETER
33 MELLONI'S THERMOMULTIPLIER
34 UNIVERSAL MEASURING DEVICE, MOVING COIL TYPE
35 AMPERE'S APPARATUS
36 MAGNETIC SPARKLER
37 INSTRUMENTS OF NOBILI'S "ELECTROMAGNETIC BOX"
38 BARLOW'S WHEEL [1]
39 SMALL CONTAINER WITH TWO VERTICAL WIRES [2]
40 SMALL CONTAINER WITH TWO HORIZONTAL WIRES [3]
41 FARADAY'S DEVICE FOR THE CONTINUOUS CIRCUIT [4]
42 DEVICE FOR SHOWING THE DIRECTIVE ACTION OF THE EARTH'S MAGNETIC FIELD ON VERTICAL CURRENTS
43 DEVICE FOR SHOWING THE CONTINUOUS ROTATION OF A MOVING CIRCUIT BY MEANS OF A FIXED CIRCULAR CURRENT
44 MATTEUCCI'S SPIRAL PLATES INDUCTION DEVICE
45 LITTLE MEDICAL INDUCTION COIL WITH MANUAL CONTACT-BREAKER (WHEEL TYPE)
46 LITTLE MEDICAL INDUCTION COIL WITH HAMMER-BREAKER (HORSESHOE-SHAPED ELECTROMAGNET TYPE)
47 INDUCTION COIL
48 INDUCTION COIL WITH PLATINUM AND MERCURY CONTACT-BREAKERS
49 INDUCTION COIL WITH SPARK GAP AND FOUCAULT CONTACT-BREAKER
50 INDUCTION COIL
51 DE LA RIVE INDUCTION COIL
52 BOURBOUZE'S ELECTROMOTOR
53 CLARKE'S MAGNETO-ELECTRIC MACHINE
54 MAGNETO-ELECTRIC MACHINE FOR ELECTROTHERAPY
55 VOLTAIC ARC WITH MANUAL ADJUSTMENT
56 ELECTRIC EGG
57 DE LA RIVE'S ELECTRIC EGG
58 GENERAL VIEW OF THE EDUCATIONAL STRUCTURE WITH DEVICES FOR ELECTRICAL ENERGY CONTROL AND DISTRIBUTION
59 RIGHI'S THREE SPARKS OSCILLATOR
60 COUPLE OF TRANSMITTER AND RECEIVER TELEPHONES WITH WHISTLE CALLING
61 FOUR TELEPHONES BELL-TYPE
62 TWO TELEPHONES BELL-TYPE
63 RIGHI'S TELEPHONE RECEIVER
64 RIGHI'S MICROPHONE
65 PNEUMATIC TELEGRAPHS (DIAL TYPE)
66 SKINWIRE FOR TELEGRAPHIC LINES
67 MORSE'S RECORDING TELEGRAPH WITH KEY

OUR COLLECTION OF SCIENTIFIC INSTRUMENTS

ELECTRICITY




Faraday's device for the continuous circuit Apparato per il giro continuo di Faraday
Faraday's device for the continuous circuit Apparato per il giro continuo di Faraday
Number of catalogue: 392 Numero di inventario: 392
Boxwood, bone, iron, paint with sealing-wax Materiali utilizzati: Bosso, osso, ferro, ceralacca
Base: Ø 40 mm; height: 73 mm Dimensioni: Base: Ø 40; altezza: 73 mm
   
Nobili describes the item as follows: «It consists of three main parts: the first is a box-wood base, the upper part crafted in the shape of a container, and which has a perforation in the centre towards the bottom. There is also a lateral perforation that communicates with the other. The second part is a magnetized cylinder, which is half-covered by the base and which has a small cup on its top. The third part consists of a mobile conductor xx [now lacking]. (The mobile conductors are joined to the lid of the box). In order to activate the device, the lateral hole of the base is first filled with mercury. Second, the point of the mobile conductor is placed on the top of the magnetized cylinder. (The top is covered by a concave piece of glass to reduce the friction). Third, some mercury is poured into the cup of the magnet and into the container of the base. Here the mercury must barely reach the lower point of the mobile conductor. In the fourth and last stage, the two connecting wires of an electromotor are taken in one's hands and are placed so that one reaches the mercury in the lateral hole of the base, and the other one reaches the mercury in the container (in this way of communication current flows through the magnet). When this action is carried out, the mobile conductor starts turning around the magnet. By inverting the position of the two connecting wires, the circuit itself is inverted, and therefore even the rotation in the mobile conductor changes direction (Faraday)» [Nobili 1834].
Nobili così descrive il pezzo: «E' composto di tre parti principali. La prima è uno zoccolo di busso [sic] incavato al di sopra in forma di vaschetta, e bucato nel mezzo sin verso il fondo: oltre a questo buco centrale ve ne ha un altro laterale che comunica col primo. La seconda parte è un cilindro calamitato sepolto per metà dentro il zoccolo, e guernito alla sua sommità d'una piccola coppa. La terza parte consiste nel conduttor mobile xx [mancante]. (I conduttori mobili sono applicati al coperchio dell'astuccio). Per mettere in azione quest'apparecchio si comincia dal riempire di mercurio il buco laterale del zoccolo. In secondo luogo si pone la punta del conduttor mobile sulla cima del cilindro calamitato. (Questa sommità è coperta d'un pezzettino concavo di vetro per diminuire gli attriti). Si versa in terzo luogo un pò di mercurio nella coppa della calamita e nella vaschetta del zoccolo. In quest'ultima il mercurio debbe arrivare appena alla punta inferiore del conduttor mobile. In quarto ed ultimo luogo si prendono in mano i due fili congiuntivi d'un elettromotore, e si fanno pescare l'uno nel mercurio del buco laterale del zoccolo, e l'altro in quello della vaschetta. (in questo modo di comunicazione la corrente passa per la calamita). Al momento in cui si compie l'ultima operazione, il conduttor mobile si mette a girare dintorno alla calamita. Col porre l'uno de' fili congiuntivi al posto dell'altro s'inverte il circuito, e con ciò si rovescia pure la rotazione nel conduttor mobile (Faraday)» [Nobili 1834].

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