124 
Iron* 
self is sufficiently intelligible, but the following remarks, 
may be usefully added* 
Ground plan of the furnace 30 feet square. 
Height from the ground 38 feet. 
Height from where the boshes begin to slant 26 feet. 
Width at the level of the platform of the boshes 9 feet. 
From the hearth to the bottom of the boshes 5 feet. 
From the hearth to the bottom of the tympan 1-4. 
Declination of the wall, from the bottom of the boshes 
upwards 9 inches per foot. 
Furnace hole 21 inches at top, 19 inches at bottom, and 
three eighths deep. 
The wall above the point of the arches, is supported by 
cross bars of thick iron. 
The dam 11 inches high, leaving 5 inches open from 
the top of the dam to the bottom of the tympan. 
The hearth is bedded on 15 inches of dry sand. 
Opening of the chimney at top 18 inches : too small. 
Some of the vacancies left in the walls to let out the 
steam (flues of 6 inches square) are shewn on the plan ; 
they may be filled up with coarse loose stone. 
Water wheel 30 feet. 
Length of shaft 33 feet. 
Width of the wheel in the clea’r 26 inches. 
Shrouding 3 14 inches by 8 inches. 
Feet. In, 
31 8 
5 4 
The height from the hearth to the trundle head 
— ■ — from the foundation to the hearth, 
______ from the narrowest part of the boshes 1 4 3 
to the widest part, J 
— — — — of the tweer (tuyere) from the hot- \ 
tom of the hearth S 
Distance from the nose of the tweer to the oppo- , « 
site walk* 
12 
} 
6 
vf 
* The blast of late years is not thrown in quite horizontally, but 
i little inclining upwards; no doubt an improvement T. G* 
