114, INSTEUCTIONS TO MARINE METEOROLOGICAL OBSERVERS 



Table 3. — Reduction of the mercurial harometer to standard gravity (-^5°) 



{30 iiirhcs) 



Table 4. — EquivaJent temperature {Centigrade and FahrenJieit) 



[C°=temperature Centigrade; r°= temperature Fahrenheit; F°=|C°+32°] 



Table 5. — Equivalent lengths {millimeters and inches) 



[1 millimeter =0.0393700 inch] 



For example, 690 millimeters =27. 16 inches 



