404. Milking Machine, about 1950. USNM 287862; 1969. A McCormick-Deering milking machine with four suction cups that worked from a gasoline-powered vacuum pump. It is a machine typical of its time and place. Gift of Conrad Lawlor, Madrid, Iowa. [Illustration: Figure 33.--International Harvester spindle cotton picker, 1942. (Catalog No. 405.)] 405. Mechanical Cotton Picker, 1942. USNM 288163; 1970. International Harvester Model H-10-H, single-row, spindle cotton picker of 1942. The Model H-10-H, developed in 1941, was the first commercially successful spindle picker. It is about 13 feet high and weighs about 4 tons. This machine and its successors completely transformed the cotton farming industry and led to the destruction of the share-cropping system. Gift of Producers Cotton Oil Co., Fresno, California, through International Harvester Corporation. 406. Duplicator, late 19th century and early 20th century. USNM 290936; 1970. This duplicator, a tube about 2-1/2 inches in diameter and about 12 inches long, was used to copy farm records. The user wrote on paper with an indelible pencil. The original paper and copy papers were placed between two water-soaked linen leaves and all was rolled up on a wooden spool. Then the spool was inserted in the tube and left for a few minutes until the penciled ink stained through the wet papers and thus made copies. This specimen was used on a farm in Virginia. Gift of Mrs. Arthur Z. Gardiner, McLean, Virginia. 407. Orchard Ladder, 20th century. USNM 290936; 1970. This ladder, about 9 feet high and with 10 steps, narrows toward the top. Adjustable legs allowed it to be moved forward or backward for the desired positions in fruit picking. Gift of Mrs. Arthur Z. Gardiner, McLean, Virginia. 408. Tobacco, 1969. USNM 291350; 1970. Leaves of tobacco, a plug of tobacco for chewing, and a leaf roll of tobacco. Gift of Mrs. Wanda White, Thurmond, North Carolina. 409. John Deere Garden Tractor, 1963. USNM 275276; 1970. The first garden tractor-riding lawn mower made by John Deere Company in 1963. Called the 110, it is a typical suburban tractor with a 7-horsepower engine and forward and reverse gears. Gift of John Deere Company, Moline, Illinois, through George Neiley. 410. Montamower Lawn Mower, 1923. USNM 293356; 1970. This lawn mower, made by Montamower Co., Traverse City, Michigan, has 16 rotary blades that are about 2 inches in diameter. The blades are set in a frame and are geared to the same number of wheels on the ground. The machine was patented on August 21, 1923. Gift of Andrew Corle, Chevy Chase, Maryland. 411. "Cyclone" Seeder, early 20th century. USNM 292872; 1971. A crank-operated broadcast seeder that the farmer carried as he walked across the field. Gift of Mrs. Alice Wiser, College Park, Maryland.