902
THEORY AND PRACTICE OF ENGINEERING.
Book II.
Labour for a Cube Metre of Sleepers tenoned and mortised to the heads of piles, andhalved at the ends to the cappings; the piles being at the same distance, and the scantlingof the timber as before, each sleeper being 5 metres long.
Hours of aCarpenter.
8 mortices and tenons as above - 26-00 ~]
4 halvings at 5 hours each - 20-00 l 49-00
Placing and adjusting ----- 3-00 J
Labour for a Cube Metre of binding Pieces, let into the piles, and bolted to
8 notches or halvings at an hour each - 8-00
8 holes for bolts, each 50 centimetres in length, giving 4metres at the rate of 3 hours for piercing on the plane,and fixing the bolt ----- 12 00
2 joints at the end, 2*50 each - 5*00
Placing and adjustment ----- 2*00
them.Hours of aCarpenter.
. 27*00
Labour for a Cube Metre of Capping or Sleepers, fixed to the piles by iron
8 bolt-holes 30 centimetres in length, giving together 2*4
metres, at the rate of 1 hour each for piercing - 2*40
8 iron pins, driven in at 0*15 hour for each - 1 *20
Placing and adjustment ----- 200
pins.
Hours of aCarpenter.
5*60
Fur the Labour when the Sleepers are under Water.
Piercing the holes
8 iron pins driven in, 0-50 hour eachPlacing and adjustment
2*404 00400
Hours of aCarpenter.
I 10-40
Labour for a Cube Metre of Platform, with deals or planks,10 centimetres, and their width 25 centimetres.
8 metres of joints in length to prepare, forming 0*8 squaremetres, at the rate of 0*15 of an hour per square metrePlacing and adjusting a square metre of HoorWhich amounts per cube metre to -
the thickness of which are
1 200-90
Hours of aCarpenter.
I 1*20
21 *00
The Labour when the Deals are framed together , and afterwards sunk under water.
Preparing the edges and adjusting the planks as beforeSinking and placing under water - - - -
Which amounts per cube metre to -If the platforms are in compartments, add per squaremetre ------
And per metre cube -
2-10
1*00
}
Hours of aCarpenter.
3*10
31*00
0*15
1*50
Labour on Timber in the Yard. — The first operation is tracing the form by applyingthe mould, and ascertaining the proper timbers for the purpose; so that none be selectedthat would occasion much waste; it is then sawn, and the face over which the saw haspassed is considered perfect; hence, there is economy in the employment of large timbers :if the faces are dressed with the axe or the adze, and the deals are formed from large tim-bers, then
Hours of aCarpenter.
To select a cube metre of timber apply it to the mould, *1
and line it out, for the least - - - - 3-00 l 4-50
for the most - - - - 6*00 I
As for the cutting, it must be estimated according to the nature of the works, they beingtoo various to be analysed: some general results will enable a judgment to be formed,which may approximate near enough for practice.
For the labour employed in cutting a cube metre of timber for the principals of a bridge,the total length of which is 36 metres, the scantling 30 centimetres, which form a cube of3-24 metres.
For cutting a Cube Metre of Timber at the Yard. — Timber not wrought when used forcentres or temporary bridges.