1951 A specialized aviation, navigation, and navigation scale called the NL-8 For Sale

These instruments were used by navigators and pilots in Soviet aviation to make quick calculations in flight without the use of electronic computers.The main functions, visible in the photo:Top section: "SPEED (km/h) - TRAVEL LENGTH (km)"This scale operates on the principle of a standard slide rule. It allows for quick calculations:Distance traveled, if speed and time are known.Travel time, if distance and speed are known.Lower section: "Instrumental altitude and airspeed"This scale is used to enter corrections. An aircraft's indicated airspeed differs from its true airspeed due to changes in air density at altitude. This scale allowed instrument readings to be converted to actual values, taking into account altitude and temperature. Middle section (sine and angle scale):It was used to solve trigonometric navigation problems, such as calculating the wind drift angle of an aircraft or determining lateral deviation.Why is this interesting today?Historical value: The NL-8 scale is the "grandfather" of modern flight computers. It reflects an era when navigation was a true art of mental and paper calculations.Reliability: Unlike modern gadgets, this scale requires no batteries and is immune to electromagnetic interference.