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![[Third series of experiments with board trusses-shows appearance of bridge, after 168,000 lbs., in addition to the weight of the bridge, had stood on it for nine hours]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTkvMDkvMDUvdGhpcmQtc2VyaWVzLW9mLWV4cGVyaW1lbnRzLXdpdGgtYm9hcmQtdHJ1c3Nlcy1zaG93cy1hcHBlYXJhbmNlLW9mLWJyaWRnZS1hZnRlci02MGU5ZDYtMTAyNC5qcGc%3D/40/31/webp "[Third series of experiments with board trusses-shows appearance of bridge, after 168,000 lbs., in addition to the weight of the bridge, had stood on it for nine hours]")
[Third series of experiments with board trusses-shows appearance of br...
No. 38 (handwritten) and 2539 (stamped) on mount. Forms part of Civil War photos, military construction and transportation in Northern Virginia and elsewhere / United States Military Railway Department (Librar... More
![[Third series of experiments with board trusses-shows appearance of bridge, after 168,000 lbs., in addition to the weight of the bridge, had stood on it for nine hours]](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTkvMDkvMDUvdGhpcmQtc2VyaWVzLW9mLWV4cGVyaW1lbnRzLXdpdGgtYm9hcmQtdHJ1c3Nlcy1zaG93cy1hcHBlYXJhbmNlLW9mLWJyaWRnZS1hZnRlci00NTE1NmYtMTAyNC5qcGc%3D/40/30/webp "[Third series of experiments with board trusses-shows appearance of bridge, after 168,000 lbs., in addition to the weight of the bridge, had stood on it for nine hours]")
[Third series of experiments with board trusses-shows appearance of br...
No. 38 (handwritten) and 2539 (stamped) on mount. Forms part of Civil War photos, military construction and transportation in Northern Virginia and elsewhere / United States Military Railway Department (Librar... More