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.
Scientific Instruments & Appliances salinometer is a type of hydrometer used to determine the concentration of salt solutions by measuring their densities.
Fact
When Christopher Columbus and crew landed in the New World they observed the natives using a nose pipe to smoke a strange new herb. The pipe was called a tabaka by the locals, hence our word tobacco. .. More >>