ERRATA— "USEFUL DATA," FIRST EDITION 



Page 13, line 1, change 747 in denominator of fraction to 805. '" 



Page 13, line 1, change 7.76% to 7.2%. ^ 



Page 13, Hne 2, change 7 . 76 to 7 . 2. *- 



Page 14, Hne 4, change 496 to 505. *~ 



Page 14, hne 4, change 292 to 283. " 



Page 15, in formula at top of page change P to p. *^ 



Page 22, shift decimal point, in all figures at top of diagram, one place to the left, to 



read 0.17, 0.18, 0.20, etc. ''' 

 Page 26, line 3 from bottom, change W to w. ' 

 Page 26, bottom line, change Wia. to Wm. ' — 

 Page 27, line 4, change "foot" to "unit." ^ — 



Page 27, line 14, change JFm to w^- * 



Page 27, line 14, change "foot" to "unit." ' ' 



Page 29, in formula 4 second equation, change (/— x) to (2Z— x). •* 



Page 29, in formula 5 third equation, change — r— to B,].x. ^^ 



Page 29, in formula 5 sixth equation, change **d<b and on same side of load" to 

 read *'a<b and y on same side of load as 6." * — 



3fS /"Si 



Page 30, in formula 9, second equation from bottom, change -=-p to =^7 "^ 



Page 30, in formula 9, last equation, change Z' to L*. " 

 Page 32, in formula 13, sixth equation, change 2w to w. * — 



Page 32, in formula 15, fourth equation, change -r- to — • ^"^ 



12 



Page 32, in formula 15, fifth equation, change ~ to ^* 



9wl^ wP' 

 Page 33, in formula 18, last equation, change -r^p to ^^r- "*'~ 



Page 34, in formula 19, second equation, change 21 to Al. ^-^ 

 Page 34, in formula 19, third equation, change 21 to 4/. * 



Page 34, in formula 20, fourth equation, change to read -|- {l—x) -\- —- (l^—x^). * 



Page 35, in formula 24, fourth equation, change to read Mx= —^ — ^77 — ^* *"^ 



ZyJ o\) Oi 



Page 36, in formula 26, last equation, change Z' to Z,'. 



Page 37, change Mm = ^ (2Z-a), to Mm = ^ (2Z-a)2. ^^^ 



Page 37. change Vm = R, = ^^^ SP, to Vm=Ri = P+p ^^^- ^^^ 



Page 37, change Vm = ^{l-a), to Vm==Ri^^(l- ^V ^-^ 



Page 37, change x = ^^p (P^ - ^«)» to x = -^ + ^^ (pb-Pa). ♦'"^ 



Page 141, in 7 pile cap, change 42.4 cu. yd. to 4.24 cu. yd. *^^ 



Page 144, in nomenclature, change P to p. ^ — 



Page 149, in fourth column, change 0.57 to 0.75 under "Percent of Core Area.' 



Page 175, Reverse the order of the first two formulas for "Area." ^- — ^ 



Page 175 in fourth line from the bottom, change 5 under the radical to *. ^^^^ 



