a: TABLE OF CONTENTS. 



CONVERSION OF MEASURES OF TIME AND ANGLE. 



Table Page 



72 Arc into time 210 



73 Time into arc 211 



74 Days into decimals of a year and angle 212 



75 Hours, minutes and seconds into decimals of a day 216 



76 Decimals of a day into hours, minutes and seconds 216 



77 Minutes and seconds into decimals of an hour 217 



78 Mean time at apparent noon 217 



79 Sidereal time into mean solar time 218 



80 Mean solar time into sidereal time 218 



MISCELLANEOUS TABLES. 



81 Density of air at different temperatures Fahrenheit . . . . 220 



Density of air at different humidities and pressures — English 

 measures. 



82 Term for humidity: auxiliary to Table 83 221 



TT 1 r ^^ ^ — 0.378^ 



83 Values of = 222 



29.921 29.921 



84 Densit}' of air at different temperatures Centigrade 224 



Density of air at different humidities and pressures — Metric 



measures. 



85 Term for humidity : auxiliary to Table 86 225 



T7 1 r '^^ (^ — 0.378^ , 



86 Values of —-- = -^ — 226 



760 760 



87 Conversion of avoirdupois pounds and ounces into kilogrammes . 226 



88 Conversion of kilogrammes into avoirdupois pounds and ounces 230 



89 Conversion of grains into grammes 230 



90 Conversion of grammes into grains 231 



91 Conversion of units of magnetic intensity 231 



92 Quantity of water corresponding to given depths of rainfall . . 232 



93 Dates of Dove's pentades 232 



94 Division by 28 of numbers from 28 to 867 972 233 



95 Division by 29 of numbers from 29 to 898971 234 



96 Division by 31 of numbers from 31 to 960969 235 



97 Natural sines and cosines 236 



98 Natural tangents and cotangents 238 



99 T^ogarithms of niimbers 240 



100 List of meteorological stations 243 



appendix. 



Constants 258 



Synoptic conversion of English and metric units 260 



Dimensions of physical quantities 262 



