Blueprint profile map, 34x169 cm (13½x66½") plus margins, on two sheets joined together. Rare profile map showing the elevations of the Sutro Tunnel, Adolph Sutro's marvelous drainage adit that made mining the Comstock Lode feasible and profitable. There is an inset map of the tunnel and surrounding area including Virginia City and Gold Hill. At lower right is imprint stating "Sunlight Printing by Kirchhoff & Specht, 1053 Harrison Str. (P.O. Box 1220) San Francisco Cal." The sun served as the light source for cyanotypes or blueprints. OCLC locates only one copy, at the University of California Berkeley.
Blueprint profile map, 34x169 cm (13½x66½") plus margins, on two sheets joined together. Rare profile map showing the elevations of the Sutro Tunnel, Adolph Sutro's marvelous drainage adit that made mining the Comstock Lode feasible and profitable. There is an inset map of the tunnel and surrounding area including Virginia City and Gold Hill. At lower right is imprint stating "Sunlight Printing by Kirchhoff & Specht, 1053 Harrison Str. (P.O. Box 1220) San Francisco Cal." The sun served as the light source for cyanotypes or blueprints. OCLC locates only one copy, at the University of California Berkeley.
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