To make the frames more rigid we braced them with diagonal
braces nailed on. When completed we set the frames up on opposite sides of
the stream and with ropes carefully lowered their upper ends until they
interlocked, the side spars of each frame resting on the cross spars of
the other. In the angles formed by the crossing side spars a center spar
was laid, and a number of floor beams or spars were stretched to this from
the opposite shores. On these a flooring was spread made of saplings, cut
and trimmed to the right size. A rustic railing on each side of the bridge
completed the structure.
[Illustration: Figs. 91 and 92. Frames for the Spar Bridge.]
[Illustration: Fig 93. The Spar Bridge.]
The Rope Railway.
[Illustration: Fig. 94. The Swing Seat.]
[Illustration: Fig. 95. Tying the Ropes to the Seat.]
[Illustration: Fig. 96. The Rope Railway.]
The mill-race was crossed further down by a rope line on which we rigged a
traveling carriage. A light manila rope was used, anchored to a tree at
each side about fifteen feet from the ground. A pulley block with a wheel
or sheave 4 inches in diameter was mounted to travel on the rope.
Suspended from this block by means of fall and tackle was a swing seat.
Pages:
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90