iOH-» THEORY AND PRACTICE OF ENGINEERING. Book II.
Dimensions.
Cubequan-tity of iron.
Dimensions.
Cube quan-tity of iron
In. Lines.
In. Lines.
Uprights, C. C.
Brought forward
•
399 9
Length -
144 0 1
The four hands to hold the
Width
0 9 ^
108 0
channels ...
_
48 0
Thickness
1 0 J
— -
Side pieces for the spindles,length -
288 0 "1
Platforms.
447 9
Width -
2 o y
Ml 0
Length of plates
160 0 1
Thickness
0 3 J
Thickness
1 6 r
60 0
10ft spindles ...
*
54 0
Width
Stirrup irons upon thescaffold.
0 3 J
four uprights.
Length -
HO 0 >
190 0
Length of the two
86 0 1
Thickness
1 0 s
Height ...Thickness
2 0 J»
43 0
Total for the uprights
-
496 0
4 bolts and screws
5 ditto ....
-
28 0
14 0
For the whole four -
-
1984 0
Pivots - - -
■
36 0
Weight 661 lbs. 5 oz. 2fi gr.
628 9
The four cries, A/.
40 0 1
Weight 209 lbs. 9oz. 2< gr.
Thickness
0 9
25 0
Sounding rod is in length
Width
0 10 J
12 feet ....
.
6 0
Four cross pieces.
Total weight of the ma-
Length ...
29 0 1
16 3 9
chine 2082 lbs. 7 oz. 62 gr.,
Thickness
0 9 j
Pinion contains
-
2 0
Wheel -
Toothed ditto -
"
8 0
12 0
17 sous 3 den.
Axle -
.
6 0
lbs. oz.
lbs.
W inch.
Copper employed : —
4 copper wheels which
Length
26 0 1
14 7 6
1 hickness
0 9 S
carry the horizontal
4 bolts.
levers of the saw -
7 10
Length -
40 0
40 0
6 copper wheels applied to
Thickness
1 0 j
the bras de force -
5 0
—
4 smaller ditto -
3 0
Total of one cric
-
123 11 3
Kondellcs or washers
4 copper plates ou whichthe large levers work -
17 8
For the four together
-
495 9
_
28
W eight 165 lbs. 4 oz.Uprights, rf, for regu-lating the movement.Length - - -
2 copper wheels upon theplate ....
1 11
168 0 l
262 6
34 13
28
Thicknesses
Key, a , for regulatingLength -
Price of copper 1670 livres
36 0 ?
36 0
1 sou 7 den.
Thickness
1 0 j
Price of scaffold for the
machine 530 livres 18 sous
Length of the 4 arms
180 0 }
101 3
4 den.
Thickness
0 9 j
Making the total cost ofthewhole 2200 livres 19 sous
Carried forward
-
399 9
11 den.
Steam Pile-driving Machine, as used in America for the construction of railways, deservesto be mentioned ; it consists of two machines, similar to those used by hand, which areplaced 6 feet apart from centre to centre; these are firmly bolted and secured to a stronghorizontal framing, and further strengthened by two oblique ladders. The frame is 9 feetwide, and 28 feet long, carries at one end a locomotive boiler II feet m length, and 30 inchesin diameter, which is calculated to bear 120 lbs. pressure per square inch, being workedonly at two-thirds that amount, making 100 strokes per minute: in the centre of theframing, and on each side of the boiler, a pair of inclined cylinders, 5^ inches bore, areplaced ; these have solid pistons which work without packing, with a 14-inch stroke, actingon right-angled cranks. The shaft centres are 1 foot 3 inches apart; the spur-wheel has56 teeth, and pinion 19 ; the bevels 101 and 40 teeth ; saw pulleys are 1 foot 9 inches and10^ inches in diameter : the ram is lifted from four to five times in a minute.
By this machine the piles are taken up by first securing the ram and then attaching thedogs to the head of the pile, and then, by means of a rope attached, and which passes up-wards through the small guide pulleys and over the outer pulley E, passes downwards, andis coiled round the pulley F fixed on the shaft G, which, being made to revolve, raises thepile to its place between the pile-engines, and is then secured by the stay H, and the hoopor iron-work which guides it perpendicularly.
For driving the pile: the stop B being withdrawn from under the ram A, the ram israised by a rope, which being secured by a staple on the top journal, passes down under thepulley I, then upwards over the pulley K, and again downwards to the drum L, uponwhich the rope is coiled; the drum is then placed on the shaft G, which is made to revolveby the spur-wheel N, working in the pinion O on the lower shaft P, which shaft revolvesby the action of the two cranks Q, placed on the ends of the shaft P j the cranks are set at