Mapcase drawer; This collection is arrranged by subject group.; Letters; Letter to F.L. Horspool from Superintendent Frederic Coudert from the Union Pacific Railroad regarding trying furnace door on a train in Ogden. Dated May 14, 1897.; Letter to F.L. Horspool from Superintendent J.F. Dunn from the Oregon Short Line Railroad Co. concerning royalty on fire doors. Dated September 17, 1897.; Letters; Correspondence to F.L. Horspool from General Master Mechanic John Hickey of the Rio Grande Western Railway about making a trial of the furnace door. Dated January 3, 1898.; Letter to F.L. Horspool from Superintendent J.F. Dunn of the Oregon Short Line Railroad Co. concerning costs. Dated January 7, 1898.; Letters; Letter to Geo. J. Kelly from W.H. Olson of the Denver and Rio Grande Railroad Co. concerning the royalties for the standard fire door. Dated March 13, 1899.; Letters; Correspondence to Horspool and Kelly from Superintendent J.H. McConnell of the Union Pacific Railroad Company concerning trial of furnace doors. Dated March 22, 1900.; Letter to Horspool and Kelly from Mechanical Engineer Max Toltz of the Great Northern Railway Line regarding his interest in information about the fire door. Dated June 15, 1900.; Letter to G.J. Kelly from Max Toltz regarding sketch and pamphlet of fire door and deflector plate. Dated June 30, 1900.; Patent Receipts; U.S. Patent Office receipt to Francis L. Horspool, May 24, 1898.; U.S. Patent Office receipt to F.L. Horspool and Geo. J. Kelly, August 10, 1901.; Pamphlet; Pamphlet for Standard Furnace Door.. and Deflector Plate by F.L. Horspool and Geo. J. Kelly, Patentees and Owners, Ogden, Utah.; Patent Information; Patent specification for Door and Deflector Plate for Steam Boiler Furnaces (Oversize)
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