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Tech/Engineering - Physics | | English term or phrase: Maltese cross tube | A Maltese cross tube consists of an evacuated conical shaped pyrex glass tube, which is fixed on a wooden stand. At one end of the tube, a cathode in the form of a circular plate is located. The anode is placed in a cylindrical rod like structure. Both the anode and the cathode are made of a transition metal such as copper. Next to the anode, a metal Maltese cross is placed vertically near the wider end of the conical tube. The end of the tube is coated with a fluorescent material called phosphor. The cathode is connected to a negative terminal and the anode to a positive terminal of a high voltage power supply.
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These days, the Maltese cross tubes are available in different forms. In one type of tube, the Maltese cross is kept horizontally. In another type, the conical tube is replaced by a spherical shaped glass tube.
PT-BR |
| | | Portuguese translation:tubo de Crookes com cruz de Malta | Explanation:
Minha sugestão...
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Note added at 2 days4 hrs (2011-02-06 11:09:49 GMT) Post-grading
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Agradeço a escolha desta resposta impopular! |
| Selected response from:
 Martin Riordan
Brazil
Local time: 00:41
| Grading comment Obrigado a todos.
4 KudoZ points were awarded for this answer |
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| Discussion entries: 0 |
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Automatic update in 00:
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1 hr confidence:   peer agreement (net): +4 | maltese cross tube Tubo em forma de cruz de malta
Explanation:
Há algumas referências na web relativas a elétrodos em forma de cruz de malta, tal como esta que transcrevo:
“…Em suas pesquisas sobre condução de eletricidade em gases sob baixa pressão, descobriu que ao reduzir a pressão (Evacuar) em um tubo de vidro provido de eléctrodos, e utilizando um elétrodo em forma de cruz de malta que o brilho produzido foi causado pelo impacto de raios invisíveis sobre o vidro, e que os raios progrediam do elétrodo negativo para o elétrodo positivo. Tais raios foram denominados raios catódicos, e Crookes acreditava que eles constituíam em partículas de cargas elétricas negativas.
http://sites.google.com/site/angeloleitholdpy5aal/pesquisas/...
Espero que ajude!
| Maria Amorim
Sweden
Local time: 05:41
Native speaker of:  Portuguese
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The translation workplace 
