On the Connexion of the Physical Sciences |
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Page 289
When the vacuum was made over a fusible alloy of tin and bismuth ; the spark was yellowish and extremely pale . Sir Humphry thence concluded that electrical light principally depends upon some properties belonging to the ponderable ...
When the vacuum was made over a fusible alloy of tin and bismuth ; the spark was yellowish and extremely pale . Sir Humphry thence concluded that electrical light principally depends upon some properties belonging to the ponderable ...
Page 302
For example , if a semicircle of bismuth be joined to a semicircle of antimony , an electric current in passing through it produces cold where it passes from the bismuth to the antimony by absorption , and heat where it passes from the ...
For example , if a semicircle of bismuth be joined to a semicircle of antimony , an electric current in passing through it produces cold where it passes from the bismuth to the antimony by absorption , and heat where it passes from the ...
Page 303
The light from zinc , cadmium , tin , bismuth , and lead , in a melted state , gives similar results ; but the number , position , and colour of the lines vary so much in each case , and the appearances are so different , that the ...
The light from zinc , cadmium , tin , bismuth , and lead , in a melted state , gives similar results ; but the number , position , and colour of the lines vary so much in each case , and the appearances are so different , that the ...
Page 332
But , in 1822 , Professor Seebeck , of Berlin , discovered that electric currents may be produced by the partial application of heat to a circuit formed of two solid conductors . For example , when a semicircle of bismuth , joined to a ...
But , in 1822 , Professor Seebeck , of Berlin , discovered that electric currents may be produced by the partial application of heat to a circuit formed of two solid conductors . For example , when a semicircle of bismuth , joined to a ...
Page 333
a ring , is heated at one of the junctions by a lamp , a current of electricity flows through the circuit from the antimony to the bismuth ; and such thermo - electric currents produce all the electro - magnetic effects .
a ring , is heated at one of the junctions by a lamp , a current of electricity flows through the circuit from the antimony to the bismuth ; and such thermo - electric currents produce all the electro - magnetic effects .
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