New-York tribune., 1901-08-18

intervals, and as each fresh one Is added the
old bonds Will be removed and new ones sub-
stituted. so as to encircle the whole number
In order that each wire shall have the right
strain upon it, and take it's proper share in the
future work of the bridge, the men see that il
lies exactly parallel with those which have all
ready been placed. Signals are given TO the
engineer TO increase relax the STRAIN when
this adjustment is made.
The wires OF steel, and coated with all
When POS have been strung they are combined
into strand by tying them together at inter-
walls Of about ten feet. with two or three turns
Of finer wire. There will be thirty-seven such
strands, and hence 1886 wires in each cable.
When the whole thirty-seven strands are fin
ished they will be incased in covering of thin
sheet steel The cables of the old bridge were
wrapped with wire. But that procedure will
not be adopted in the present case. Before the
addition of the casing the cables will be 1SA
inches In diameter. II will take about year
to finish this part OF the work.
The truss work or frame on which the floor
is laid is lattice OF steel. II is so designed
as TO remain rigid when heavy loads move over
il. and to resist the strongest winds that strike
il on the sides The same amount Of steel gives
far greater strength. vertically and sidewise n
put in the form OF open frame than in one solid
plate or Dedip. IIe laNQ span JfUSSeS or the
new bridge are already finished. While they
were goiag Up i. was necessary 20 sust ain them
with temporary wooden frames built Up over
the street. There wiz be 10 suspenders to con-
meet them with the main cables. When the
main span, over the river IS being built work
will be pushed from each tower. and the neces-
sary support viii re afforded chiefly By the sUs-
pende-s which VIII 5e rugged simultaneously.
one important difference between the Old
bridge and the viii lie in the provisions
made for the expansion Cf the truss work Of the
main span That Cf The old structure is cut in
two il the middle and in zero weather there is
gap nearly eighteen inches wide, covered b
metal plates. Each ho.ls expands seven or eight
inches in summer In consequence. the lower
ends cf the sugpenders. which are here from
twenty t. thirty inches long are displaced IN
very hot or Very cold weather In the new
bridge the gaps or slip joints. Will be at the
towers not in the middle At these points the
suspenders will be nearly two hundred feet long.
and the same displacement OF their lower ends
will hardly throw them out of plumb strain
their connect tions with the truss \ new mode
of attaching the suspenders 70 the cables viii
b, employed The wire rope constituting the
sUspender viii be doubled, and the main cable
viii pass through the loop thus formed. The
loop Will res; in sort Of saddle placed o. the
cable. and not touch the latter directly. The
two lower ends Of the suspender vii. be fastened
70 the truss work in much the same on
H. old bridge
When a bridge crosses river with high, steep
banks. as at Niagara The ends usually
Gown the level OF the earth BUT when the
shcres low. and Yet IT i necessary to raise
the structure tc such "a heign; 70 allow ships
pass under freely. then the ends far above
ground. Ia such eases IL becomes necessary to
build slrping extensions. OF approaches. Those
Of the old Brooklyn Bridge are of masonry. The