C—3.

channel intended to be used give ultimate results quite as correct as the best and more complex methods given in works on this special subject. The attached table is founded on Eytelwein's formula; it gives the length of pipe in which 1 ft. of head is absorbed by friction in clean pipes from 6 in. to 36 in. in diameter when carrying from one to fifteen sluice-heads of water. Examples. What is the loss of head in 2,000 ft. of clean 15 in. pipes when carrying eight sluice-heads of water ? The length of pipe given in the table in which 1 ft. of head is absorbed in 15 in. pipes carrying eight sluice-heads of water being 77 ft.— ~ = 25-97 ft. loss of head. If the pipes are slightly rough add 30 per cent.— 25-97 + 25-97 x 0-3 = 7-79 33-76 ft. loss of head. If pipes are very rough, and badly laid, add 60 per cent.— 25-97 + 25-97 x 0-6 = 15-58 41-55 ft. loss of head. What is the loss of head in 1,740 ft. of clean 15 in. pipes when carrying nine sluice-heads of water ? _. 28-52 ft. loss of head. ol What is the loss of head in 1,580 ft. of rough and badly-laid 11 in. pipes when carrying nine sluice-heads of water ? = 121-53 + (121-53 x -6) = 194-44 ft. loss of head. If the quantity of water intended to be used is more than fifteen sluice-heads, take from the table the number corresponding to one-half, one-third, or one-fourth the intended quantity, and divide by 4, 9, or 16 respectively. The loss of head in a 20 in. pipe, carrying ten sluice-heads of water, is Ift. of head in every 209 ft. length of pipe (as per table). The loss of head in a- 20 in. pipe, carrying twenty sluice-heads of water, is 1 ft. of head in every &s*■ = 52-25 ft. length of pipe. The loss of head in a 20 in. pipe, carrying fifteen sluice-heads of water, is 1 ft. of head in every 93 ft. length of pipe (as per table). The loss of head in a 20 in. pipe, carrying forty-five sluice-heads of water, is 1 ft. of head in every ?£ = 10-33 ft. length of pipe. The loss of head in a 20 in. pipe, carrying sixty sluice-heads of water, is 1 ft. of head in every s 3 = 5-81 ft. length of pipe. Length of Pipe (in Feet) in tvhich lft. of Head is absorbed by Friction in Pipes from 6 in. to 36 in. in Diameter when Carrying from One to Fifteen Sluice-heads of Water. B 10560 (Calculated from ™— = length for lft. of head.)

166

!■§ 3' d M a o CO ■a Q a o <0 XD o S3 to te ci to X CD j» E 0Q <o W M '•Jl a S CD Tfc> cd ■r. Q a 1 to rri =6 CO X a o H Si 4-,*$ O CtJ a a 5! gS 3,3 S a 6 7 8 9 10 11 12 13 14 15 16 17 18 20 22 24 26 28 80 32 34 36 51 110 214 386 654 1,054 1,628 2,430 3,519 4,969 6,862 9,292 12,366 20,943 33,729 52,112: 77,760: 112,630! 159,040! 219,620; 297,370' 395,730 5 12-7 ) 27-5 53-5 I 96-5 163 263 I 407 I 607 ' 879 1,242 1,715 2,323 3,091 5,235 8,432 13,028 19,440 28,157 : 39,760 : 54,905 I 74,342 ; 98,932 - ' 5-6 > 12-2 i 23-7 i 42-9 72 117 180 270 391 552 762 1,032 1,374 2,327 3,747 5,790 8,640 12,514 17,671 24,402 : 33,041 : 43,970 ! > 3-1 ! 6-9 ' 13-4 I 24-1 40-7 65 101 151 219 310 428 580 773 1,308 2,108 3,257 4,860 7,039 9,940 13,726 18,585 : 24,733 : 2 ) 4-4 i 8-5 15-4 26 42 65 97 140 198 274 371 495 837 1,349 2,084 3,110 4,505 6,362 8,785 11,895 15,829 : [ 3 i 5-9 10-7 18 29 45 67 97 138 190 258 344 581 936 1,447 2,160 . 3,128 : 4,418 I 6,100 ■ 8,260 ( 10,992 ( 2-2 ) 4-3 f 7-8 13 21 33 49 71 101 140 189 252 427 688 1,063 1,587 : 2,298 : 3,246 ; 4,482 j 6,068 '. 8,076 ( i ! 3-3 ! 6 10-1 16 25 37 54 77 107 145 193 327 527 814 1,215 1,759 : 2,485 : 3,431 : 4,646 , 6,183 ( ! 2-6 4-7 8 13 20 30 43 61 84 114 152 258 416 643 960 1,390 : 1,963 : 2,711 i 3,671 '. 4,886 ; > 2-1 3-8 6-5 10-5 16 24 35 49 68 92 123 209 337 521 777 1,126 1,590 : 2,196 : 2,973 ! 3,957 ! .. ! 3-2 i 5-4 i 8-7 13 20 29 41 56 76 102 173 279 430 642 930 1,314 : 1,815 : 2,457 ! 3,270 : ! 2-6 4-5 7-3 11 16 24 34 47 64 86 145 234 361 540 782 1,104 1,525 : 2,065 : 2,748 I I 2-2 3-8 I 6-2 9-6 14 20 29 40 55 73 124 199 308 460 666 941 1,299 1,759 2,341 ! ! ! 3-3 ! 5-3 I 8-3 12 17 25 35 47 63 106 172 265 396 574 811 1,120 1,517 : 2,019 : I 2-9 I 4-6 7-2 10.8 15 22 30 41 55 93 149 231 345 500 707 976 1,321 1,758