One of the best ways of cleaning an infected wound, used before the days of antibiotics and now with infections that antibiotics can't treat, is to put maggots into it to eat the rotting flesh.
Scientific Instruments & Appliances commutator is an instrument to change of reverse the direction of an electric current. in dynamo used to convert the alternating current into direct current.
Scientific Instruments & Appliances computer is a technical device designed to find instantaneous solutions of huge and complex calculation based on the information already fed.