Full text: Life of Thomas Telford, Civil engineer, written by himself (Haupt.)

    
   
    
      
  
  
  
  
  
    
   
  
  
  
  
  
  
  
  
   
    
  
  
  
  
  
  
  
  
  
  
  
   
    
  
  
  
  
  
APPENDIX (L. 4) 
ArpenpIx (L. 4.) 
DESCRIPTION axp SPECIFICATION or tae SPEY-SIDE ROAD. 
  
ROAD from the Bridge over the River Spey, near Grantown, to and including the Bridge 
over the River Avon, at Ballindalloch. 
  
1st Divisiow. 
From the south abutment of the bridge over the river Spey to the burn of Cromdale, 
being a distance of 2 miles 1,590 yards. 
The south-east wing wall of Spey Bridge must be taken down and rebuilt, nearly 
parallel with the river; the rock for the foundations of this wall must be cut six feet 
in width, with its direction dipping into the bank, at a right angle with the outside 
batter of the wall. The thickness of the masonry to be six feet at an average, and carried 
to the proper height, to correspond with the parapet over the arch. The road must 
afterwards be carried eastward, with a very gentle rise along the face of the steep rocky 
bank, and have its lower side protected with a breastwork, and a parapet-wall upon the 
top of it, built with stone and lime, for 150 yards in length, and coped agreeably to the 
specification ; and along the upper side a retaining wall will be required. 
Proceeding forward, the line passes through the lower corner of a small inclosure, along 
the top of some arable land, crosses the head of a small valley, and then enters a more 
level moor, along which it proceeds in nearly a strait line to a small burn, which it 
crosses, and passes through a small cultivated inclosure, and along the low bank, partly 
through birch wood, and partly through a pasture-field, till it reaches the burn of Congash, 
where a twenty-feet arch will be required; the gravel for backing this bridge to be got 
from the corner of the east bank, in order to cut off the acute angle which the line makes 
  
  
immediately after crossing. From this point, the road keeps nearly the same level along 
the face of the bank, and below the garden of Congash, till it has passed the head of the 
small gulley, and then in a south-east direction, as marked on the ground, till it enters : i 
a birch-wood ; it then crosses the burn, and then by the skirts of two projecting points ; 
it then bends to the eastward, and follows the general direction of the old road, though 
partially deviating from it in several instances, to preserve the regularity of the surface. 
It then proceeds, nearly level, to about 170 yards beyond where the road branches off to 
Cromdale. At this point, instead of following the old road to the bridge of Milltown, 
which is ruinous, and inconveniently steep, it must descend along the face of the bank, in 
the direction marked off, till it reaches the bottom ; it then keeps along the base, and 
nearly in the same direction to the burn of Cromdale, over which a thirty-five-feet arch 
must be built. The earth and gravel for forming the embankment at the west end of it 
must be taken from the east bank, in order to regulate the rise and uniformity of the 
road-surface at that place. Here the 1st Division ends. . 
Throughout the whole of this section, breast and retaining-walls will be required, with 
a very considerable quantity of cutting and embanking, in order to form the surface of 
 
	        
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