BRIDGE PIVOT AT HAWARDEN. 43I
(figs. 410 and 411), the method of suspension has been adopted, but in a
kindred example at
Liverpool (figs. 412 and
413). the bridge was
superimposed. Tilting
is very possible, and
there is even a ten-
dency to disturb the
bridge to a dangerous
extent in the absence
of proper précautions.
A bridge of this de-
scription was invaded
one dinner hour, by a
dense crowd of im-
patient working men
before it had ceased
swinging, with the re-
sult that it canted over
CROSSHEAD.
10"
SECTION AT CEN TR)
- CV-osaheadb riuxde (ff
Siemens mild; fortud. St^cV.
forward, and a disaster
was only averted by
the nose-end coming
into contact with, and
resting upon, the pas-
sage gates. Conséquent
upon this mishap, the
intermediate bearing
blocks were made con-
tinuous throughout the
arc of travel, so that
ELEVATION
I
i
I
I
excessive tilting at any
stage of the rotation
was rendered impos-
sible on any future
occasion.
(d) A dwarf, cylin-
drical pivot, also with
a concave seat, as at
the Fleetwood bridge
(figs. 414 and 415).
Any overturning lever-
age exerted upon the
support is reduced to a
minimum, but the
steadiness of the bridge
«1
PLAN. SECTION AT C. D.
Figs. 410 and 411. —Bridge Pivot at Hawarden.
is thereby lessened. A peculiar feature about the