EditorialTechnicians test the Juno spacecraft for center of gravity, weighing and balancing on a rotation stand in Titusville, Fla., on June 16, 2011. (Kim Shiflett/NASA via The New York Times)
EditorialImage 6 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 7 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 10 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 5 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 8 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 4 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 10 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 2 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 16 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 11 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 17 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 1 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 4 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 9 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 10 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 2 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 6 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 8 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 1 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 15 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 9 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 3 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 8 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 5 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 11 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 14 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 2 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 7 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 5 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 7 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Mar 1887. 10 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 12 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 6 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 4 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 3 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 18 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 13 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 3 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Dec 1893. 11 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 1 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.
EditorialImage 9 of Sanborn Fire Insurance Map from Titusville, Crawford County, Pennsylvania. Oct 1898. 18 Sheet(s), America, street map with a Nineteenth Century compass.