242 Mr Stevenson's Description of' Bridges of Suspension. 
the chain-bridge of Dryburgh ; but we shall first describe the 
wire-bridge of Ki ngsmead o ws, on the estate of Sir John Hay, 
Bart., of which we have given a sketch in Fig. 2. This foot- 
bridge is thrown across the Tweed, a little below Peebles. It 
is 110 feet in length, and 4 feet in breadth, and is ornamented 
with a handsome lodge or cottage, as will be seen delineated on 
the sketch. This work was contracted for, and executed by 
Messrs Redpath and Brown, of Edinburgh, in the summer of 
1817, and cost about L. 160. 
It may be described as consisting of two hollow tubes of 
cast-iron, which are erected on the opposite sides of the river, 
set 4 feet apart, into each of which a corresponding bar of 
malleable iron is fitted, and to these the suspending wires and 
braces are respectively attached by screw bolts. The lower 
ends of the hollow tubes forming the piers, are secured by a 
brander or grating of timber, (according to a plan by Mr Turn- 
bull, architect in Peebles), laid under ground, and shewn in 
the connecting diagram, marked letter a. Fig. 2. They are fur- 
ther supported under the roadway, by struts or diagonal posts, 
which act against the strain of the weight and motion of the sus- 
pended roadway. The upright bars noticed above, form the 
gates or approaches to the bridge ; and to these the suspending 
wires and braces are attached ; their respective lengths being 
adjusted at pleasure, by screw-bolts. These hollow tubes of 
cast-iron measure 9 feet in height, 8 inches in diameter, and fths 
of an inch in thickness of metal. The malleable iron-bars, 
which are inserted into these hollow tubes, form the points of 
suspension, measure 10 feet in height, and are 24 inches square. 
The roadway is formed with frames of malleable iron, to 
which deal boards, measuring 6 inches in breadth, and 1 1 inch 
in thickness, are fixed with screw-bolts. The side-rails are 
neatly framed with rod-iron, on which a coping, or hand-rail of 
timber, is fixed. The roadway here is suspended by diagonal 
wires, in a manner different from the catenarian principle, as 
will be seen by comparing Fig. 2. with Figs. 1. 3. and 4. 
Plate VIII. The chain-suspending wires of Fig. 2. are of the 
strength known to artists as No. I. of the wire-gauge, mea- 
suring about T 3 0 ths of an inch in diameter. The back or land- 
ward braces are made of bolt-iron, fths of an inch in diameter, 
