CONTENTS 



Page 



Preface iii 



Introduction 1 



Conversion of units of length and mass 1 



Standard gravity for reducing barometric observations 3 



Calorie 4 



Section I. CONVERSION TABLES 

 Table 



1. Conversion factors 9 



2. Approximate absolute, centigrade, Fahrenheit, and Reaumur tem- 



perature scales 17 



3. Fahrenheit to centigrade . . . ,, 20 



4. Centigrade to Fahrenheit 25 



5. Differences Fahrenheit to differences centigrade 29 



6. Differences centigrade to differences Fahrenheit 29 



7. Centigrade degrees per kilometer to Fahrenheit degrees per 1000 



feet 30 



8. Fahrenheit degrees per 1000 feet to centigrade degrees per kilo- 



meter 30 



9. Inches of mercury to millibars 31 



10. Millibars to inches of mercury 38 



11. Millimeters of mercury to millibars 51 



12. Millibars to millimeters of mercury 59 



13. Inches to millimeters 72 



14. Millimeters to inches 79 



15. Feet to meters 92 



16. Meters to feet 94 



17. Statute miles to kilometers 96 



18. Kilometers to statute miles 98 



19. Nautical miles to statute miles 100 



20. Statute miles to nautical miles 100 



21. Nautical miles to kilometers 101 



22. Kilometers to nautical miles 101 



23. Days to decimals of a year and angle 102 



24. Time to arc 106 



25. Hours, minutes, and seconds to decimals of a day 106 



26. Decimals of a day to hours, minutes, and seconds 107 



27. Minutes and seconds to decimals of an hour 107 



v 



