1953F. PrattCritique of Science Fiction in R. Bretnor Modern Science Fiction 75
If the author is going to use speed greater than light or matter transmission, he at least owes us a reasonably plausible explanation of how these things work.
1951F. PrattAsylum Satellite in Thrilling Wonder Stories Oct. 26/1
In firing a torpedo you want an impact at the end of the run, a big smash. A message rocket would have to arrive in shape to deliver the message, so velocity would have to be considered.