291. Mining iron ore (17:05)

Date:
unknown/unknown
Summary:
A film explaining the iron mining process as practiced on the iron ranges of Minnesota, Wisconsin, and Michigan.

292. Mitosis and meiosis (17:01)

Date:
1956
Summary:
Uses stained cells, animation, and time-lapse cinephotomicrography of living cells to compare mitosis and meiosis. Shows onion root tip, whitefish embryo, salamander epidermal, and living Tradescantia staminal hair cells photographed in time-lapse photography to present the details of mitosis. Portrays the basic features of meiosis by using lily anther cells and living sperm cells of a grasshopper photographed by time-lapse photography. Animation sequences give a side-by-side comparison of the two processes and show how mitosis, meiosis, and fertilization fit into the life cycle of common organisms.

293. Molding a horizontal cored part (21:54)

Date:
1945
Summary:
Use of a horizontal core, a split pattern, chaplets, and chaplet supports; how to gate a mold for rapid pouring of a thin casting; and how to clean a casting.

294. Molding with a gated pattern (11:17)

Date:
1944
Summary:
Shows what a gated pattern is and why it is used, how a match or follow board can simplify making a parting, how facing sand is prepared and used, and how and why some patterns are rapped.

295. Molding with a loose pattern (21:05)

Date:
1944
Summary:
Shows how to identify and use common bench molder's tools; how molding sand is prepared; how to face a pattern; how to ram and vent a mold; how to roll a drag; how to cut a sprue, runner, gates and riser; how to swab, rap, and draw a pattern; and, by animation, what takes place inside a mold during pouring.

296. Molding with a loose pattern (floor) (24:04)

Date:
1945
Summary:
Shows the difference between bench and floor molding, how to face a deep pattern, ram a drag and walk it off, clamp a mold, locate sprues and risers, and tuck the crossbars of a large cope.

297. Molding with a three part flask (34:59)

Date:
1945
Summary:
Shows how to use a deep follow board; the technique of facing, ramming, and venting a deep green sand core; how to use a cheek in a three-part flask; and the purpose and method of step-gating.

298. Motivation and Reward in Learning (14:17)

Date:
1948
Summary:
Compares a hungry, active rat with a satiated, inactive rat. The hungry animal learns to get food by pressing a bar, while the satiated animal goes to sleep. To demonstrate that failure to learn is due to lack of motivation, a mild electric shock is supplied and the satiated animal becomes active and learns to strike a lever which turns off the shock. Shows the animal also learning to rotate a wheel, bite a rubber tube, and strike another animal to avoid electric shock.

299. Music and architecture through the ages (16:14)

Date:
1958
Summary:
This film follows developments in music through human history supplemented by visuals of art and architecture of the period. Traces ancient civilization through to the 18th century with a heavy concentration on Europe.

300. Musical performance improvement for snare drum (21:53)

Date:
1960
Summary:
Vern Reimer gives instruction, through demonstrations, on how to improve a drummers performance. He discusses the common mistakes made by student drummers and how to correct them. Targeted for the snare drum.