502 CONTENTS. 



PAGE 



TIMBER, MEASUREMENT OF, Illustrated 61 



Board measure 62 



To ascertain the contents (board measure) of boards, scantling, 



and plank 62 



Table, showing the contents of inch boards from 6 inches to 30 



broad, and from 4 to 24 feet long 63 



Square timber 65 



To measure square timber 65 



Plank measure 62 



Table, showing the contents (board measure) of planks of various 



dimensions 67 



Round and square timber 64 



To measure round timber, Illustrated 65 



Logs reduced to inch-board measure 70 



Table, showing the number of feet (board measure) of inch 



boards contained in round saw-logs of various dimensions.. . . 71 



TIME, SEASONS, &c., Illustrated 19 



To reduce longitude to time 19 



Time, apparent and mean 21 



To ascertain the length of the day and night 21 



Pendulums, Illustrated 31 



To find the length of a pendulum for a given number of vibra- 

 tions per minute 31 



To find the vibrations per minute, the length of the pendulum 



being given - ; 32 



Measure of time, table, Illustrated 25 



Division of the calendar year 26 



