What is anode rays

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An anode ray (also positive ray or canal ray) is a beam of positive ions that is created by certain types of gas-discharge tubes. They were first observed in Crookes tubes during experiments by the German scientist Eugen Goldstein, in 1886

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Inventor: Eugen Goldstein

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An anode ray (also positive ray or canal ray) is a beam of positive ions that is created by certain types of gas-discharge tubes. They were first observed in Crookes tubes during experiments by the German scientist Eugen Goldstein, in 1886.Later work on anode rays by Wilhelm Wien and J. J. Thomson led to the development of mass spectrometry.

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productive most commonly means: achieving or producing a significant amount or result.

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productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.