. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 2 —PRESSURE. 1. Glass tube. 2. Brass casing. 3. Leather joint. 4. Top flange. 5. Flanged cylinder. 6. Leather gasket. 7. Ivory point. 8. Glass cylinder. 9. Mercury. 10. Long screws. 11. Leather gaskets. 12. Lower flange. vita i^# ' B IP 13. Upper curved cylinder. 14. Split-ring clamp. 15. Leather gasket. 16. Lower curved cylinder. 17. Wooden bearing. 18. Leather bag. 19. Cistern housing. 20. Screwcap. 21. Adjusting screw. the back. With the cover open, the barometer is completely exposed, so that all parts
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 2 —PRESSURE. 1. Glass tube. 2. Brass casing. 3. Leather joint. 4. Top flange. 5. Flanged cylinder. 6. Leather gasket. 7. Ivory point. 8. Glass cylinder. 9. Mercury. 10. Long screws. 11. Leather gaskets. 12. Lower flange. vita i^# ' B IP 13. Upper curved cylinder. 14. Split-ring clamp. 15. Leather gasket. 16. Lower curved cylinder. 17. Wooden bearing. 18. Leather bag. 19. Cistern housing. 20. Screwcap. 21. Adjusting screw. the back. With the cover open, the barometer is completely exposed, so that all parts are accessible and adjustments can be made easily. A metal hanger inside the case near the top and a centering ring near the bottom provide means for suspending the barometer. Two openings in the back of the case are fitted with white opal glass or heavily pigmented white Plexiglas to facilitate reading the scales and observing the cistern level. Two brackets are provided for mounting the case on a wall, post, or other suitable vertical surfaces. SCALES.—The Fortin barometer has two scales. One is the stationary scale, which allows reading of the barometer to the nearest of an inch (also graduated in millibars, but not read). The other is an adjustable scale, called the vernier, which is graduated to allow reading the barometer without interpolation to the near- est of an inch. Maintenance Preventive maintenance for the Fortin barom- eter consists largely of cleaning, minor adjust- ments, and daily inspections. These inspections include checking for cracks in the glass tube or cylinder; damage to the wooden case; loose screws in the case brackets, hanger, and centering ring of the case; and condition of the mercury column. If a cracked tube, a mercury leakage, or other damage that may affect the accuracy of the instrument is discovered, it becomes necessary to request a replacement barometer and to ship the defective barometer to NAS, Norfolk or NAS, Alameda for
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Keywords: ., bookcentury1900, booksubjectmeteorology, booksubjectunitedstates
