1 A normal pregnancy lasts about 40 weeks and is grouped into three trimesters.  Symptoms of early pregnancy include the absence of menstrual periods, breast changes, tiredness, nausea, mood swings, or other symptoms.
What is ENCODING ALTIMETER? An altimeter designed for automatic reporting of altitude to air-traffic control. A special encoding disk within the instrument rotates in response to movement of the aneroid capsules, and transmits a signal which is amplified, fed to the aircraft. ALTIMETER.
IV. Instrumental errors of barometric altimeters and air data computers Further errors lowering the accuracy of the altitude measurement by barometric mechanic altimeters are instrumental errors caused by qualities of barometric boxes, it means hysteresis and elastic after-effect, and also errors caused by the friction in the gear mechanism.