Box PHOTO0020.01

Scope and Contents Five albumen prints of a Buttress Dam/Ambursen Dam (All five measure 12.75 x 18 cm in cardstock frame 20 x 25 cm). The buttress dam also called the Ambursen dam was named after a Norwegian American inventor and engineer named Nils Frederick Ambursen (1876-1953) who invented the design in the early 20th century. He held many patents on concrete forms applied to dam building. His first patent is dated 1903. He formed the Ambursen Engineering Company to build his type of dam. At one time...

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4/5/’21 R.C. (R.C. is in a circle) (The date and R.C. is in white lettering at the bottom center of the print. The photo shows a double row of crib forms extending into a shallow river with buildings beneath a hillside in the background.)

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8/5/’21. R.C. (R.C. in circle) (White lettering repeated, The photo shows the double crib forms now partially filled in and a cascade of water gushing over sheet piling holding back the fill. There are several crane structures and a building with a water tower and tall shute possibly a concrete plant. Tracks are now on top of the crib forms that entirely span the river.)

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Oct-23-21 RC (White lettering repeated but date is now at lower right corner. The photo shows the double crib forms with the railroad tracks and cars but in the center are now concrete forms in place. A double cascade of water falls over the sheet piles. Additional buildings beneath the water tower on the river bank.)

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(Shows concrete monoliths with railroad tracks and a locomotive with hill in the background).

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(Shows a crane lifting a metal truss on construction site).

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(Three span Whipple pin-connected through truss railroad bridge, circa 1880s. All photos are albumen prints measuring 20 x 25 cm on heavy card stock with dark brown border)

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(Image shows construction of a double railroad track three span Whipple pin-connected through truss bridge. Three men sit on top girder, large groups of men laying track, in foreground four boys stand between tracks, one man wearing derby standing on left set of tracks. Bridge crosses a river to a shore with farm houses. Bridge structure appears similar to Delaware Water Gap bridge and Emlenton Bridge both in Pennsylvania)

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(Image shows three spans finished with ten standing on bottom chord beneath track bed. Two men standing on track bed. Bridge is supported on four masonry piers. Snow is on piers and bridge.)

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(Image shows steam locomotive on right track , thirteen workmen stand on track and beside locomotive. Ice on river below and snow on bridge and piers.)