83,993). It was made for educational purposes
for schools and laboratories and for use in private homes to germinate
seeds, microscopic organisms, etc. Gift of E. A. Braun, Chatham, New
Jersey.

376. Ten-Gallon Milk Can, 1920s or later. USNM 282324; 1968. An
unexceptional milk can of about 1920, with the more common type of lid.
It was found at the farm of Malcolm Brumback, near Belle Grove
Plantation, Middleton, Virginia. Purchased.

377. Hand Corn Shuckers, late 19th century. USNM 282324; 1969. Seven
hand corn shuckers, each consisting of a spike attached to a handle
which fits over the hand. These are quite typical and of a type used for
over a century. Gift of John N. Hoffman, Washington, D. C.

378. Model Toy Tractors, 1968. USNM 282697; 1969. Ten model toy
tractors, authentic as to outward details: (1) Caterpillar D6, (2) A. C.
Crawler, (3) Minneapolis-Moline, (4) Oliver, (5) Case, (6)
Allis-Chalmers, (7) G-1000 Vista, (8) Ford, (9) I. H. Hay Baler, (10)
Ford set. Gift of Ertl Company, Dyersville, Iowa, through Fred Ertl, Jr.

379. Sidehill Plow (Knapp), late 19th century. USNM 282926; 1969.
Sidehill plow patented and manufactured by the Knapps. The plow can be
flipped over at the end of the row to cast all the furrows in one
direction when plowing on hills. One of several variations on the idea.
This is a copy of a 19th-century plow. Gift of N. E. Knapp, through
Leslie O. Merrill of San Mateo Historical Association, San Mateo,
California.

380. Crop Meter, about 1925. USNM 283306; 1969. This crop meter was
developed in 1925 by the Department of Agriculture as an aid in
estimating the acreage of cotton in Mississippi. The crop meter was
attached to the dashboard of an automobile and connected by cable to the
odometer. A circuitous route was followed through the cotton area, and
when the driver came to the edge of a cotton field he pushed a button
which started the meter measuring the frontage of the field. The total
mileage registered could be interpreted in terms of the acreage. The
meter method was later replaced by aerial observation. Gift of
Statistical Reporting Service, U. S. Department of Agriculture, through
Harry C. Trelogan.

381. Cotton Boll Weigher, about 1930. USNM 283306; 1969. A cylinder,
2-1/2 feet high, for measuring the size of a cotton boll by water
displacement. When this device was used in conjunction with the crop
meter, the actual fiber yield of a year's crop could be estimated. Gift