The principle of the barograph is same as that of the aneroid barometer. He was a pioneer in using the aneroid barometer for measuring altitude. In the bottom centre is the aneroid (large circular silver object). He settled in Aneroid, Saskatchewan, and took up farming there. Aneroid barometers are used in scuba diving. The measurement of these pressures is now usually done with an aneroid or electronic sphygmomanometer. In 1886, the Faura Aneroid Barometer was released. The control system used a pneumatic/vacuum system, an electric system and an aneroid barometer/altimeter. Inside the instrument, there is a sealed aneroid barometer. As the pressure decreases, the spring lifts the aneroid and the arm moves down. An aneroid barometer was carried to mark out 50 feet contour levels. A sign near Saskatchewan Highway 13, just outside Aneroid, proclaims that it is Marleau's hometown. Pressure can be measured using an aneroid, Bourdon tube, mercury column, or various other methods. For example, an aneroid barometer uses rotary position as the signal to convey pressure information.