Maryland.

360. Winnowing Machine, mid 19th century. USNM 270009; 1966. Typical
mid-19th-century fanning mill with vibrator cleaner. Gift of Mrs. Henry
C. Slunt, Hyattsville, Maryland.

361. Winnowing Machine, mid 19th century. USNM 270009; 1966. Typical
mid-19th-century fanning mill with screen vibrator cleaner. Gift of Mrs.
Henry C. Slunt, Hyattsville, Maryland.

[Illustration: Figure 29.--John Deere Model D tractor, 1923. (Catalog
No. 362.)]

362. John Deere Model D Tractor, 1923. USNM 270865; 1967. The John Deere
Model D was the first tractor of the line bearing that name. The
Waterloo Tractor Works, Waterloo, Iowa, made the tractor in 1923. Gift
of Deere & Company, Moline, Illinois, through George F. Neiley.

363. Waterloo Boy Model N Tractor, 1918. USNM 270864; 1967. The Waterloo
Boy tractor was manufactured first as Model R, in 1914, and then as
Model N, beginning in 1918. The Waterloo Gasoline Engine Company of
Waterloo, Iowa, made the Waterloo Boy. It was the first tractor marketed
by the John Deer Company, which acquired the Waterloo Gasoline Engine
Company in 1918. The Waterloo Boy continued to be produced by John Deere
Company until 1923, when that company brought out its own Model D. Gift
of Deere & Company, Moline, Illinois, through George F. Neiley.

[Illustration: Figure 30.--Cheese press. (Catalog No. 364.)]

364. Cheese Press, late 19th century. USNM 170886; 1967. Small, wooden,
hand-operated cheese press, dating from the late 19th century but not
unlike those in use a century before. Gift of Carlton M. Gunn,
Sunderland, Massachusetts, through Allister F. MacDougall.

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.