Plate V, Figures 68 and 73. In: "Traite de topographie, d'arpentage
et de nivellement" 1807, by Louis Puissant. NOAA Central Library Call No.
TA545 .P9 1807. A sighting instrument with accompanying targets.
Image ID: libr0078, Treasures of the NOAA Library Collection Photographer: Archival Photograph by Mr. Sean Linehan, NOS, NGS
