first detector in a sentence

Examples

1. The first detector of Viola & Jones had 38 stages, with 1 feature in the first stage, then 10, 25, 25, 50 in the next five stages, for a total of 6000 features.
2. Soon after, he was the first to realize it might be possible to detect the minute distortions of space called gravitational waves that had been predicted by Einstein's theory of relativity, and Weber built the first detectors to search for them.
3. In the early 1960s, Dr . Joseph Weber of the University of Maryland based one of the first detectors on a huge aluminum bar that was supposed to ring like a bell when penetrated by a gravity wave of the right frequency.