» Clark Battery (1900) (0267)
Immagini
DESCRIPTION
Exhibit 267 is a Clark battery built in 1900 by Hartmann and Braun. It consists of a glass tube in the form of the letter H, with internal platinum wires extending from the bottom halves as terminals. This structure is contained in a metal cylinder which has a hole in the bottom and an enclosure for a thermometer in the top. The scheme of the battery is in figure 4.The positive pole is pure mercury in contact with a mercury sulphate paste, which serves as depolarizer. The negative pole is an amalgam of zinc and mercury (90% Zn, 10% Hg), in contact with a solution of zinc sulphate. The electromotive force of this battery is 1,4326 volts at 15° C. and it varies with temperature according to the relation; EQ01: [ \rm E(t) = (1,434 - 0,0012(t-15)) ]. This instrument caries the date of 1900.
ISCRIZIONI
- Incisioni sulle etichette di ottone: 1900, Hartmann & Braun FRANKFURT A.M.
- Incisioni sul cilindro contenente il termometro: NORMALELEMENT N L.CLARK
- Scritte sul termometro: G.S. 108, 1899 e logo
BIBLIOGRAPHY
- [1] N.S.Khare & S.S.Srivastava, "A TEXTBOOK of MAGNETISM AND ELECTRICITY", Ed. 1959, Atma Ram & sons, Delhi-6, India, pag.163
- [2] URL [ http://humboldt.edu/~scimus/Instruments/Elec-Duff/StdCellDuff.htm ]
Dati Catalografici
| Data di costruzione: | 1900 |
|---|---|
| Data di carico: | ignota |
| Nr. Inventario: | Ignoto (Ignoto) |
| Costruttore: | Hartmann & Braun A. G. |
| Materiale: | metallo, vetro |
| Dimensioni: | Cilindro: altezza 11 cm, diametro 5,7 cm; Contenitore termometro: altezza 8 cm, diametro 2 cm; Fessura per termometro: altezza 5 cm; larghezza 1 cm |
| Conservazione: | cattivo (La pila deve essere internamente rotta perchè dal foro in fondo esce della polvere) |