365. Gas-Turbine Tractor, 1965. USNM 274549; 1967. This HT-340 experimental gasoline turbine tractor operates with a hydrostatic transmission. It is air-cooled and has no brakes, gears, or clutch. The 90-pound motor produces 85 hp. It tended to rear back because of its excessive power and so could not be put into commercial production until a less-powerful engine had been developed. Gift of International Harvester Company, through John J. Dierbeck. [Illustration: Figure 31.--Fitzhenry-Guptill power sprayer (1908), seen here spraying for elm leaf beetles on the grounds of the U.S. Capitol, May 1911. (Catalog No. 366.)] 366. Fitzhenry-Guptill Power Sprayer, 1908. USNM 275103; 1967. This is the first power sprayer used by the U. S. Department of Agriculture. It was built in 1908 and used to spray for gypsy moths in New England. It was horse-drawn and had a 2-cylinder mounted engine to furnish power for the sprayer. Gift of U. S. Department of Agriculture, through E. D. Burgess. 367. Truck Seat, about 1921. USNM 276080; 1967. This truck seat, invented and manufactured by the Bostrom Corporation, is significant because of its suspension system, which gave greater comfort and convenience to the driver and came to be used in many truck and tractor lines of several manufacturers. Gift of Bostrom Corporation, Milwaukee, Wisconsin, through Karl Bostrom. 368. Tractor Seat, about 1921. USNM 276080; 1967. A suspension seat for tractors produced by the Bostrom Corporation in 1921. It was used first on the Oliver tractor. All seats now used on tractors derived from this basic design. Gift of Bostrom Corporation, Milwaukee, Wisconsin, through Karl Bostrom. 369. Hog Snouter, late 19th century. USNM 275604; 1968. The snouter is a scissors-like device for clamping a ring in the pig's nose. The ring prevents the animal from rooting under or against fences. Gift of Mr. and Mrs. George E. Morgenstern of Lake Forest, Illinois. 370. One-Way Disk Plow, about 1924. USNM 277629; 1968. Invented in the 1920s but declared unpatentable by the Patent Office, the one-way disk plow became commonplace in the dry farming areas of the Great Plains. The disks, set at an angle, cast less furrow than a moldboard plow. This specimen is a reconstruction of the original. Gift of Francis Angell, Plains, Kansas. 371. Wine Press, about 1884. USNM 279451; 1968. The donor's father brought this wine press to the United States from Rheinfeldon, Switzerland, in 1884. Gift of Mrs. Clara Bieber, Washington, D. C. 372. Mill Picks, late 19th century. USNM 279452; 1968. Steel picks used to repair and sharpen grooves in millstones. Gift of C. W. Wimberly, San Marcos, Texas. 373. Seamless Flour Sack, late 19th century. USNM 279452; 1968. A fairly typical flour sack of the time, although sacks with seams were more common. Gift of C. W. Wimberly, San Marcos, Texas.