OCR Text |
Show Sound Waves Find Fish Fishermen of Loch Fyne, Scot-hind, Scot-hind, are catching their herring by means of electric sound waves. The electric wavc3 cannot be heard on hind or sen, but ore produced by quartz crystal in an echomctcr. The instrument has been fitted to a Scottish Scot-tish west coast trawler. Waves sent out from it are echoed back from a slmal of hi-rrini:, the fish having in tlwir bodies suIliLlcnt air to react to the i-lcc'.rical charge transmitted. 'Il.c cchomHiT tells first when a sIhmI is ii'-ar, secondly where it is. |