What is a fortin barometer and does it works
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Fortins Barometer is a modified form of simple barometer.
It is used in laboratory to measure the atmospheric pressure.
Construction:
1. The fortin barometer consist of a narrow galss tube of about 85 cm to 90 cm
2. This tube is closed at one end and has opening at other end.
3. It is completely filled with pure mercury and it kept inverted in a glass vessel having a leather cup containing mercury.
4. The open end of the glass tube is dipped into the mercury
5. The galss tube is protected by enclosing it in a brass tube.
6. At the bottom of th brass tube there is screw s The Pointed end of which touches the bottom of the leather cap.
7. The mercury level in the glass vessel is adjusted to 0 mark of the main scale.
8. the Zero mark of fixed scale is Represented by Tip of an ivory pointer I
9. The upper part of the brass tube has a slit in it to see the mercury surface in the galss tube.
10. For accurate measurment a vernier scale is provided which can slide over the main scale with a screw r and a Thermometer T is also Mounted which records the Room Temperature.
Working:
to measure the Atmospheric Pressure:
First the leather cup is rasied up or lowered donwn with help to screw s so that the ivory pointer I just touches the mercury level in the galss vessel.
The readings of the main scale and vernier scale are then noted
The Sum of 2 Readings gives the Barometeric height.
It is used in laboratory to measure the atmospheric pressure.
Construction:
1. The fortin barometer consist of a narrow galss tube of about 85 cm to 90 cm
2. This tube is closed at one end and has opening at other end.
3. It is completely filled with pure mercury and it kept inverted in a glass vessel having a leather cup containing mercury.
4. The open end of the glass tube is dipped into the mercury
5. The galss tube is protected by enclosing it in a brass tube.
6. At the bottom of th brass tube there is screw s The Pointed end of which touches the bottom of the leather cap.
7. The mercury level in the glass vessel is adjusted to 0 mark of the main scale.
8. the Zero mark of fixed scale is Represented by Tip of an ivory pointer I
9. The upper part of the brass tube has a slit in it to see the mercury surface in the galss tube.
10. For accurate measurment a vernier scale is provided which can slide over the main scale with a screw r and a Thermometer T is also Mounted which records the Room Temperature.
Working:
to measure the Atmospheric Pressure:
First the leather cup is rasied up or lowered donwn with help to screw s so that the ivory pointer I just touches the mercury level in the galss vessel.
The readings of the main scale and vernier scale are then noted
The Sum of 2 Readings gives the Barometeric height.
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