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.
Scientific Instruments & Appliances mariner's compass is an apparatus for determining direction, graduated to indicate 33 directions. the "n" point on the dial indicates north pole and the "s" point, south pole.
Scientific Instruments & Appliances periscope is an apparatus for viewing objects lying above the eye level of the observer and whose direct vision is obstructed.
Fact
Whenever you see a dog pawing at the ground after finishing its business, do you think it's neatly covering up its poo? Well, it's not. They are leaving traces of their unique scent behind, which is released from odour glands on the bottom of their paws. .. More >>