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Pingenot Auction, Lot 190

190. [MAP]. TEXAS. GENERAL LAND OFFICE. Map of Eastland Co. Corrected and Drawn by F. G. Blau. Houston: [Rand, Avery & Co. of Boston for] Robt. M. Elgin, 1877. Heliotype process map. 56 x 54.2 cm (22 x 21-3/8 inches). Rough along right edge and a few other short tears on blank margins, otherwise very good.
        Scarce county map put out by the General Land Office, drawn by Blau, one of the top GLO mapmapers. The process used to create this map was one not in use for a lengthy period. Heliotype images were obtained by printing from a film of gelatin which had been sensitized with bichromate of potash and exposed to light under a negative.