File:The Architect and engineer of California and the Pacific Coast (1910) (14597997770).jpg

Identifier: architectenginee2210sanf (find matches)
Title: The Architect & engineer of California and the Pacific Coast
Year: 1905 (1900s)
Authors:
Subjects: Architecture Architecture Architecture Building
Publisher: San Francisco, Calif. : Architect and Engineer Co
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library

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Fig. 3—Old Trestle Two Seconds after the Explo The Architect and Engineer reason why the rails and ties of the old structure had to be preservedso as to use them for the track until the ballast was put on. Tlu-n after everything u.i> in readiness, the dynamite in the post wasexploded by means of a battery, as seen in Fig. 2. Fig. 3 shows the old trestle on the bottom, about two seconds afterthe explosion occurred, after which the girders were lowered into placeand the temporary track laid to permit the passing of the trains. The whole proceedings averaged two hours and forty minutes fromthe time the last train passed until the track was ready for the next train. The construction of the derrick cars was as follows: Two 40-foot steel cars of 50-ton capacity were coupled and boltedtogether so as to be able to travel without changing the distance from endto end. Then cross timbers were put on the cars about every ten feet,the tops of them being thoroughly greased, sills being placed

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