642 Original Articles. [Oct., 
from Webster and Horsfall’s homogeneous iron, each wire surrounded separately 
with 5 strands of Manilla yarn, saturated with a preservative compound, and the 
whole laid spirally around the core, which latter is padded with ordinary hemp, 
saturated with preservative mixture. 
Weight in Air.—85 ewt. 3 qrs. per nautical mile. , ! 
Weight in Water.—14 ewt. per nautical mile, or equal to 11 times its weight 
in water per knot; that is to say, it will bear its own weight in 11 miles depth of 
water. 
Breaking Strain.—7 tons 15 ewt. ; 
Deepest Water to be Encountered.—2,400 fathoms, or less than 2} nautical miles 
im depth. 
The Contract Strain is equal to 11 times its weight per nautical mile in 
water, 
One Knot, being in fathoms = 1,014 x 11 = 1335* 4-64 times the strength 
requisite for the deepest water. 
ON THE PROPORTIONAL NUMBERS OF THE 
ELEMENTS. 
By Wriuuram Opuine, M.B., F.R.S. 
Upon arranging the atomic weights or proportional numbers of the 
sixty or so recognized elements in the order of their several magni- 
tudes, we observe a marked continuity in the resulting arithmetical 
series, the only exceptions to the very gradual increase in value of 
the consecutive terms being manifested between the numbers 40 and 
50, 65 and 75, 96 and 104, 138 and 184, 184 and 195, and 210 and 
231°5, thus :— 
H 1 Hydrogen. Fe 56 Iron. Cd 112 Cadmium. 
L 7 Lithium. Co 59 Cobalt. Sn 118 Tin. 
G 9 Glucinun. Ni 59 Nickel. U 120 Uranium. 
By Li Boron: Cu 63°5 Copper. Sb 122 Antimony. 
C 12 Carbon. Yt 64 Yttrium. I 127 Iodine. 
N 14 Nitrogen. Zn 65 Zine. Te 129 Tellurium. 
O 16 Oxygen. As 75 Arsenic. Cs 133 Cesium. 
F 19 Fluorine. Se 79-5 Selenium. Ba 137 Barium. 
Na 23 Sodium. Br 80 Bromine. V 137 ~~ ~=Vanadium, 
Mg 24 Magnesium. tb 85 =©Rubidium. Ta 138 Tantalum. 
Al 27:5 Aluminium, | Sr 87:5 Strontium. W 184 ‘Tungsten. 
Si 28 Silicon. Zr 89-5 Zirconium, Cb 195 Niobium. 
P 31 Phosphorus. | Ce 92 Cerium. Au 196-5 Gold. 
S 32 Sulphur. La 92 Lanthanum. Pt 197 Platinum. 
Cl 35:5 Chlorine. Dy 96 Dydymium. Tr 197 Tridium. 
K 39 Potassium. Mo 96 Molybdenum. | Os 199 Osmium. 
Ca 40 Calcium, Ro 104 Rhodium. Hg 200 Mercury. 
Ti 50 Titanium. Ru 104 Ruthenium. Tl 203 ‘Thallium, 
Cr 52:5 Chromium, Pd 106°5 Palladium. Pb 207 Lead. 
Mn 55 Manganese, | Ag 108 Silver. Bi 210 Bismuth. 
Th 231°5 Thorinum, 
