Chap. X.
VALUE OF ARTIFICERS’ WORKS.
899
together, for a cube metre of work, occupies ten hours of labour; placing rods for hurdleson a square metre 0*65 hours, which amounts for a cube metre of work to 3*25 hours : thetime necessary for spreading the sand is about 0 25 hours per square metre, whichamounts to 0'75 hours for a cube metre of work. The workmen usually have higherwages than the labourer; and the incidental expenses to be added are one-twentieth.
Carpentry. — The labour of this work includes the setting out at large the price ofthe timber, &c., the carriages, sawing, framing, and taking it to pieces in the yard;removing it to its destination, and raising the same in its place. The following calcu-lations suppose the use of oak timber ; with regard to fir, birch, chesnut, and other qualities,it will be easy to form a judgment of the proportion according to which it will be necessaryto reduce the quantity of labour, which depends on the hardness and specific gravity of thetimber.
Mean.
To make a mortise requiresTo make a tenon
* at least - 1 *00
at most - - 2 -00 f
I* at least - - 1*251
L at most - - 2*25 J
Halving the ends of plates or other timbers - -
For a square metre in joints at the ends of brestsummer, &c.which gives for one joint, supposing the piece to be 25 cen-timetres square, and at the joint 50 centimetres in length -Supposing the piece 35 centimetres square, and at the joint 1metre in length ------
For common framing - - - - -
1*50
1-75
100
1*31
3-68
dovetailing ------
boring a metre in length for bolts -
boring the timber when fixed -sawing a square metre of timber on tresselssawing in the yard a square metre of the ends of timbercutting off the heads of piles with the hand-saw for a square metresawing a square metre of planking with dittolining out and squaring for use - -
To fix a kilogramme of iron when the iron is to be let indrive in or pull out ah iron pin -
1
Hours of aCarpenter.
3*25
1 0010-50
2-50
500600i *a>
300
1-40
5-00
- 1050
- 12-50
1-500 20
- 015
Carpenter’s work may be divided into several kinds: as that for foundations or scaffold-ing, which do not require timber to be squared or prepared; it is equally useless to reduceit to one thickness, except where planks are required to unite in a very exact manner: thelabour is reduced to framing done on the spot, and fixing.
Temporary bridges and centres to vaults require that the timbers should be preparedafter a working drawing, and the framing put together in the yard, but not wrought onthe face : with regard to the carpentry of timber bridges, it is done agreeably to a drawing;the framing prepared and put together in the yard, and the faces wrought.
There are also works executed after a drawing that do not require to be wroughtentirely, as horizontal sleepers or joists and binding pieces, which are generally faced inthe yard, cut to a length and fitted at the place, the price of which differs from that ofthe timber.
Planking and Piling.
Preparing a pile for scaffolding, forming the head, and fixing the shoe
Letting in the shoe, weighing 5 kilogrammes at 0-20 hours for each
Do. for a pile used in foundations ------
Letting in the shoe, weighing 10 kilogrammes at 0-20 hours for eachTo sharpen and prepare a lineal metre of sheet-planking, and putting on theshoes if not let in
If the joints are grooved and tongued -For fixing the sheet piles -
which gives for a sheet pile, 5 metres long, if the jointsare square, 5 metres at 0-20 hours for eachPut into the frame or placed -
If the joints are grooved and tongued, 5 metres at 0*80 hours foreach .
Put into the frame ------
If the shoes of the weight of 5 kilogrammes are let in, we mustgrammes at 0-20 hours for each -
1-000-20
4-000-20add 5 kilo-
Parts of anHour.
1- 251-00
2- 502-00
0-20
0-80
0-20
1-20
4-20
1-00
3 m 2