The New Encyclopaedia Britannica, Volume 18Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
From inside the book
Results 1-3 of 84
Page 287
... Devices Thermionic devices convert heat directly into electricity by means of thermionic emission - the ejection of elec- trons from a heated surface - rather than by changing it first to some other form of energy . Heat for the device ...
... Devices Thermionic devices convert heat directly into electricity by means of thermionic emission - the ejection of elec- trons from a heated surface - rather than by changing it first to some other form of energy . Heat for the device ...
Page 288
... device . A typical cesium vapour - filled device , with cylin- drical electrodes one inch ( 25.4 millimetres ) long and one - half inch ( 12.7 millimetres ) in diameter , produces 0.7 volt at 70 amperes ; a flat converter 14 inch ( 31.8 ...
... device . A typical cesium vapour - filled device , with cylin- drical electrodes one inch ( 25.4 millimetres ) long and one - half inch ( 12.7 millimetres ) in diameter , produces 0.7 volt at 70 amperes ; a flat converter 14 inch ( 31.8 ...
Page 317
... devices . Semiconductors have rel- atively large thermoelectric powers and are thus prefer- able to metals as the active materials for most thermo- electric applications . In a basic device , two bars of semiconductor , called ...
... devices . Semiconductors have rel- atively large thermoelectric powers and are thus prefer- able to metals as the active materials for most thermo- electric applications . In a basic device , two bars of semiconductor , called ...
Other editions - View all
Common terms and phrases
19th century actors adiabatic process applied audience broadcasting cable called camera carpels carrier centimetres centre channels chemical chrominance circuit classical colour commedia dell'arte communications court device drama drugs early effect eigenvalues electrical electrons energy engine entropy Eocene equation Europe fabrics fibres Figure film frequency Germany Greek heat important increased industry loom machine material mechanical megahertz ment metal method metres millimetres Miocene modern modulation Oligocene operation Paleocene pattern percent performance picture play pressure production radio real tennis receiver religious Roman scanning signal social space species stable equilibrium stage steam teachers techniques tektites telegraph telephone teleprinter telescope television temperature tennis tetraodontiforms textile textual criticism Thailand theatre theatrical thermodynamics thermoelectric thermoreceptors tion transmission transmitted tube ture United usually warp weave weft wire yarns