Items
Item Number Date Description
U-040 More info . . . U-040 1917 Improving St. Marys River, Michigan, Fourth Lock: Drawing No. 1047 - Operating machinery, details of hydraulic engines for butterfly valve of equalizing culvert
U-041 More info . . . U-041 1917 Improving St. Marys River, Michigan, Fourth Lock: Drawing No. 1040 - Operating machinery, pressure piping for valve engines, pipe shaft to lower valve pit, southeast wall
U-042 More info . . . U-042 1917 Improving St. Marys River, Michigan, Fourth Lock: Drawing No. 1039 - Operating machinery, pressure piping for valve engines, pipe shaft to upper valve pit, southwest wall
U-043 More info . . . U-043 1917 Improving St. Marys River, Michigan, 1350 X 80 ft. Lock: Drawing No. 400 - General plan, butterfly valve and valve engine, assembled
U-044 More info . . . U-044 1917 Improving St. Marys River, Michigan, 1350 X 80 ft. Lock: Drawing No. 412 - Culvert valves, details of butterfly valve
U-045 More info . . . U-045 1917 Improving St. Marys River, Michigan, 1350 X 80 ft. Lock: Drawing No. 574 - Electric winding engine for gate operation
U-046 More info . . . U-046 1891 Looking west up Weitzel Lock
U-047 More info . . . U-047 7 November 1907 Bayfield Shoal Dyke: View of upper end, looking northwest
U-048 More info . . . U-048 7 November 1907 Bayfield Shoal Dyke: General view looking northwest
U-049 More info . . . U-049 27 October 1889 Middle Neebish, Hay Lake Channel: Men assembled on dike, viewed from lower end
U-050 More info . . . U-050 25 March 1893 Ice Survey, Hay Lake Channel: Survey party taking soundings
U-051 More info . . . U-051 25 March 1893 Ice Survey, Hay Lake Channel: General view of camp
U-052 More info . . . U-052 17 March 1894 20 and 21 Foot Channel: Ice boring machines and sounding reels
U-053 More info . . . U-053 26 February 1895 20 and 21 Foot Channel: General view of camp
U-054 More info . . . U-054 25 March 1893 Ice Survey, Hay Lake Channel: Interior view of sleeping tent
Showing 1711 to 1725 of 1780 items