rginia.

400. Hay Rake, 1900-1910. USNM 287135; 1969. A McCormick-Deering sulky
rake with spring steel teeth and a hand-operated dumping mechanism. Gift
of Innes Saunders, Leesburg, Virginia.

401. Book: The Growth of Industrial Art, 1892. USNM 287863; 1969. This
200-page book by Benjamin Butterworth was printed at the Government
Printing Office, Washington, D. C., in 1892. It contains line drawings
of many agricultural tools and implements, some of them ancient. Gift of
William Perkins, Hyattsville, Maryland.

402. Corn Huskers, early 20th century. USNM 287593; 1969. These huskers
fit over the hand like a glove without fingers. A steel hook in the palm
removed the corn husks. Similar devices date back to at least the early
19th century. Gift of Melvin Deschner, Halstend, Kansas.

403. Corn Huskers, late 19th century. USNM 287591; 1969. Similar to the
huskers in Number 402. Gift of Cecil Eberle, Newton, Kansas.

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. T