The Atlantic Cable. 13 
(No. 13 gauge), drawn from Webster and Horsfall’s homo- 
geneous iron, each wire surrounded separately with five 
strands of Manilla yarn, saturated with a preservative com- 
pound, and the whole laid spirally round the core, which 
latter is padded with jute yarn, saturated with preservative 
mixture. ° 
Weight in air—35 cwt. 3 qrs. per nautical mile. 
Weight in water—14 cwt. per nautical mile. 
Breaking strain—7 tons 15 cwt., or equal to eleven times 
its weight in water per nautical mile; that is to say, the 
cable will bear its own weight in eleven miles depth of 
water. 
Deepest water to be encountered—2,400 fathoms, or less 
than 24 nautical miles. 
The contract strain is equal to eleven times its weight 
in water. 
Length of cable shipped—2,300 nautical miles. 
Conductor—Copper strand consisting of seven wires (six 
laid round one), and weighing 300 lbs. per nautical mile, 
embedded for solidity in Chatterton’s compound. Gauge 
of single wire 048 = ordinary 18 gauge. Gauge of.strand 
‘144 = ordinary No. I0 gauge. 
Insulation—Gutta percha, four layers of which are laid 
on alternately with four thin layers of Chatterton’s com- 
pound, The weight of the entire insulation 400 lbs. per 
nautical mile. Diameter of core ‘464, circumference of 
core 1°392. 
External protection—Ten solid wires of. the gauge ‘095 
(No. 13 gauge), drawn from Webster and Horsfall’s homo- 
geneous iron, and galvanised, each wire surrounded sepa- 
rately with five strands of white Manilla yarn, and the 
whole laid spirally round the core, which latter is padded 
with jute yarn, saturated with preservative mixture. 
Weight in air—31 cwt. per nautical mile. 
