The pressure altitude system in an approved recorder has the same function as a barograph and must be calibrated to the ICAO ISA ( International Civil Aviation Organisation International Standard Atmosphere ).
22.
The Barograph in the centre of the High Street was erected in 1911 as a memorial to some of the Tebbutt family and is kept in working order by the Bluntisham Feoffees charity.
23.
This type of barometer is common in homes and in recreational boats, as well as small aircraft . It is also used in meteorology, mostly in barographs and as a pressure instrument in radiosondes.
24.
Several barographs recorded the wave seven times over the course of five days : four times with the wave travelling away from the volcano to its antipodal point, and three times travelling back to the volcano.
25.
Re-calibrations to check any errors from the ICAO ISA are carried out at regular intervals in the same way as an analogue barograph that uses an aneroid pressure sensor rather than an electronic pressure transducer.
26.
As the years progressed, pilots used ( film ) cameras to photograph each turnpoint from the air to prove that they had rounded each one and a barograph to prove that they had not landed en route.
27.
Earhart also puts into words that she carried a barograph, that at one point recorded a vertical drop of almost three thousand feet, yet she miraculously was able to regain control and successfully completed her flight.
28.
The barograph recovered showed the aircraft had reached 10, 000 m ( 32, 810 ft ) but a failure of one of the cupola windows had led to a rapid decompression and death of the pilot.
29.
Marine barographs ( used on ships ) often include damping, this evens out the motion of the ship so that a more stable reading can be obtained, this can be either oil damping of the mechanism or simple coiled spring feet on the base.
30.
The Post Office barograph fell to 944.8 hPa at 4am 21st but was prevented by the flange from falling below 944.8 hPa . The wind changed from the southeast to the north around 8am 21st with no abatement and increased in violence.
