906
THEORY AND PRACTICE OF ENGINEERING.
Book II.
the timbers to adapt them for the second centre. The manner of establishing this price dependsin some degree upon the arrangement made with the contractors. Supposing the contrac-tors take the timber back at two-thirds its original value, and the volume is equal to thatwhich has been used, the price of the cube metre of timber for the first centre will be —
Francs.
A cube metre of timber delivered ----- 75-00
A tenth for waste ------- 7*50
Hours.
Labour at the yard, lining out and gauging - 3*00
Cutting and framing ----- 15*00
Taking to pieces, numbering, &c. - I'00
Total -
19 hours of a carpenter at 0-35 francs valueCarriage - - - - -
Raising : 5 hours of a carpenter10 hours of a labourer at 0*2 francs -Striking the centre : 2 hours of a carpenter -4 hours of a labourer at 0*2 francSecond crrriage -
One tenth of labour for incidental expenses -
1900
Francs.
6*65
0-94
1*75
2*00
0-70
0'80
0-94
13*78
1*38
Total
One tenth for profit
97*66
9-77
Total
Deduct two-thirds of the value of the timberRemains
107*43
50-00
57*43
"With regard to the second centre, admit that in reworking the timber, a loss of a fifteenthtakes place, the price of the cube metre will be —
Loss or waste, one fifteenth on 75 francs -
Labour (as above) ------
Incidental expenses - -
Profit
Total
Total
Francs.
500
13-78
1*38
20-16
2*02
22-18
Suppose, after an exact account is taken of the loss timber is subject to in the formingof centres, it be ascertained that after the execution of the first centre it has lost two-fifthsof the primitive value, and after that of the second a fifth of the second value, the priceof the cube metre of timber of the first centre would be —
Loss on the value of the timber, two-fifths of 75Labour, as before -
Incidental expenses -
One-tenth profit
.
Francs.
30*00
_
-
-
- 13-78
-
-
-
1-38
Total
- 45 16
-
-
-
4-52
Total
-
-
- 49 *68
And observing that when the timber has sustained a loss of 30 francs out of 75 francs,it is only worth 45, the price of the cube metre for the second centre will be —
Loss on the value, one-fifth of 45 francsLabour, as before - - -
Incidental expenses, ditto
Francs.
9*00
_
-
.
- 13-78
-
-
-
1-38
Total
_
_
- 24*16
-
-
-
2*42
Total
-
- 26*58
One tenth for profit -