Browse By

Tag Archives: index error

Aneroid Barometer

 An Aneroid barometer is an instrument used for measuring atmospheric pressure. It uses a small flexible material box called a vaccum chamber (capsule), which is made from an alloy of beryllium and copper. The vacuumed capsules are prevented from collapsing by a strong spring. Small

Correction To Sextant Altitudes

Why Correct Altitude As you have already learnt that the altitudes of the sextant are observed above the visible horizon. Eventually that altitude needs to be converted as an altitude above the rational horizon, which is a line parallel to the sensible horizon, passing through