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I am defining an instrument but am not sure if it is correct to combine past and present tense at the same time:

Ssdd is the first ever instrument, launched in 1998, which was specifically designed to measure the gmn at Ka-band at global scale.

Is the usage of is and was correct?

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    The example may be a bit unsuitable here, but yes, in appropriate cases, each clause can have its own tense, so to speak.
    – Kris
    Commented Sep 3, 2014 at 11:27
  • Some of the Qs in the "RELATED" box at right may also interest you. Esp., english.stackexchange.com/q/174751/14666
    – Kris
    Commented Sep 3, 2014 at 11:34

1 Answer 1

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No, it's not right to mix tenses. The sentence is in any case somewhat muddled. I would reword it thus:

Ssdd, launched in 1998, was the first instrument specifically designed to measure the GMN, at Ka-band, at the global scale.

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    Why do you think not?
    – Kris
    Commented Sep 3, 2014 at 11:28
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    I used to think it wasn't correct to mix tenses, but now I'm not so sure.
    – SrJoven
    Commented Sep 3, 2014 at 11:45
  • In that rewording, two articles (before GMN and global) and the commas around at Ka-band are superfluous. Perhaps instead write “Ssdd, launched in 1998, was the first instrument specifically designed to measure Ka-band GMN at global scale.” Commented Sep 3, 2014 at 15:27

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