61. Determining molecular formulas (12:45)

Date:
1961
Main contributors:
Max J. Rosenberg, Ellis Katzman, Elbert C. Weaver, John A. Skarulis, William H. Pasfield, Herman J. Engel, Robert Braverman, Ross Lowell, Geraldine Lerner, Peter Robinson
Summary:
Records an experiment in which the molecular weight of a compound is determined through knowledge of the percentage composition by weight of the compound and application of Avogadro's Law. Animation is employed to show the differences in characteristics of two substances of identical composition through reference to the substances' molecular structure.

62. Digestive systems in animals (14:50)

Date:
1971
Summary:
Shows the variety of ways animals obtain food and their different types of digestive cavities--fully closed, one opening, and two openings. Examines digestive organs in an earthworm, grasshopper, frog, cat, and bird. Looks at peristalsis in a dog's stomach and the action of the villi in a pigeon's small intestine.

63. Dimpling and Countersinking (20:56)

Date:
1947
Main contributors:
Jam Handy Organization, Division of Visual Aids, United States Office of Education, Federal Security Agency
Summary:
Shows how dimpling and countersinking prepare metal for flush riveting, how to operate a dimpling machine, and how to countersink work for flush rivets.

64. Disorders of coordination (44:53)

Date:
0000
Main contributors:
E. Herz, T. J. Putnam
Summary:
Demonstrates a number of tests for disorders of coordination and discusses the causes of the various types of disorders.

65. Disorders of the motor trigeminal, spinal accessory, and hypoglossal nerve (21:03)

Date:
0000
Main contributors:
E. Herz, T. J. Putnam
Summary:
This film presents the anatomy, symptomatology, and clinical picture of disorders of nerves. Shots include: unilateral paralysis of masticatory nerve, paralysis of right masticatory nerve, disorders of the spinal accessory nerve, motor fibers supplying sternomastoid muscle, atrophy of the upper portion of the trapezius muscle, scapula alata in paralysis of serratus anticus muscle, motor fibers leaving medulla between olive and pyramid, bilateral paralysis of hypoglossal nerves, scars of gunshot injury bilateraly, slow response to galvanic stimulation, severe atrophy and immobility of tongue, and bilateral paralysis of glossopharyngeal and vagus nerves.

66. Diversity in Plant and Animals (30:26)

Date:
1962
Main contributors:
Dr. Ray Koppelman, University of Chicago, American Institute of Biological Sciences
Summary:
Diversity of life resulting from evolution: recognition and treatment of diversity –definitions and taxonomic approaches; results of diversity in the plant kingdom; results of diversity in the animal kingdom, with particular emphasis on the evolution of man; diversity in time –divergence, convergence, extinction, the fossil record diversity in space –ecological relations in a habitat.

68. Driving economically (17:47)

Date:
1952
Main contributors:
National Commission on Safety Education, National Education Association
Summary:
Economical driving practices are suggested by a service station operator to a boy who has just received permission to drive the family car alone. Includes care of the car's finish, warming up of the engine, proper use of clutch, efficient braking practices, and the effect of acceleration and speed on tire wear and gasoline consumption.