Identification. There are many species of salamanders but some of the most toxic are tiger salamanders, spotted salamanders, and the rough-skinned newt. Salamanders excrete milky toxins through their skin when touched or eaten.arshes, ponds, lakes and streams are common areas where salamanders are found during breeding season. Other times they are seen in drier areas such as forests and fields. Salamanders are amphibians, which characteristically breathe through gills, have smooth skin, and produce jelly-coated eggs.
Microphone development as we know it today was distilled from telephone technology, whose roots go back to the mid 1800s. The word âmicrophoneâ was ï¬rst coined by Wheatstone around 1827 and was used to describe a purely acoustic device, like a stethoscope, which he had developed to amplify weak sounds. The word is Greek in origin, with âmicroâ meaning small and âphonâ meaning sound. It was not applied to telephone devices in general, which were instead called âtransmitters,â a practice continued by Western Electric almost until it ceased professional microphone production in the 1940s.
A brief history of microphones A brief history of microphones By Hugh Robjohns The humble microphone has been with us for well over a century and has come a long way from its crude beginnings. Identifying the inventor of the microphone is not a simple task, and depends very much on the definition used. In the beginning