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Demonstrates the production of vowels using requested loudness on first trials. Depicts the pupil applying her "part" learning, loudness, to get proper accent on the word "mama" through verbal request alone.
Shows how to select and lay out stock to avoid waste; how to reverse curves to contour lines; how to use the table tilting gage; how to saw a bevel reverse curve; how to prepare a template for a newel post; and how to saw a newel post having reverse curves.
Crown Film Unit, British Information Service, South African Bureau of Information
Summary:
A British production reporting on the contribution of South Africa, a sovereign Dominion of the Commonwealth, to the Allied war effort. Declares that the former antagonism between races - Dutch, English and Bantu - has been overcome. "This film opens with a brief outline of the country, showing how it is a land of contrasts in farming, living, worshipping, trading and in transport, and tells how South Africa made her own decision to enter the war and how she backed that decision. With the help of the British Admiralty, a navy was built up to defend the coastline , and RAF experts aided in South Africa's Air Training Scheme" (The Educational Screen, February 1944, 92).
How to select the correct arbor; mount the work head; adjust the work head for clearance settings; and set up for sharpening the outside diameter, corner, and face.
Portrays the frequency of a mutant in the gene pool as reaching a state of equilibrium when, per generation, its origination by mutation equals its elimination by genetic death. Discusses genetic death and presents examples of how genetic loads are changed subsequent to radiation exposure. Pictures the great majority of mutants as harmful when homozygous, but some cases, as in sickle call anemia, heterozygotes are adaptively superior to normal homozygotes. Explains balanced polymorphism, by which a gene is retained in the population despite its lethality when homozygous because of the advantage it confers when heterozygous. Lectures given by Dr. Thomas Dobzhansky.
Discusses the role of heredity and environment in determining the sex of various organisms. Indicates that in some organisms it is the environment in which a given genotype functions that determines whether differentiation shall occur as male or as female. This is exemplified by sex determination in certain snails, mosses, and worms. Portrays a difference in genetic constitution as primarily responsible for sex determination in other organisms as for a unicellular plant (Chlamydomanas), certain grasshoppers, Drosophila, man, and the mouse. Discusses the genetic basis for sex mosaics (gynandromorphs) and indicates the influences of the "y" chromosome in determining sex in man. Lecture by Dr. C. Stern.
Portrays sex as a polygenic trait which may be considered to be determined by the balance of genes on different chromosomes. This view is substantiated by the work of R. Goldschmidt on the gypsy moth and its intersexes, and is most clearly demonstrates in Bridges' studies of different sex types in Drosophila. Discusses sex determination and the role of hormones in sex differentiation in the case of man. Depicts the human sex ratio and the cause of significant deviations in it from normality, and discusses the possibility of controlling sex by separating male and female producing sperm. Lecture by Dr. C. Stern.
Technique of drilling and tapping blind holes in cast steel on a radial drill. A drill jig with loose bushings is used for locating the holes. Setting up the work on the table of the machine, setting the jig on the piece to the layout lines. Calculating the size of the tap drill and the method used when setting the machine to drill a number of holes to the same depth. A wizard drill chuck is used in the drilling operation, and a standard friction chuck for holding the tap. The action of a tap in a hole is shown in animation and the reason why a tap binds in the hole and must be reversed frequently when tapping in tough metals.
Division of Visual Aids, U.S. Office of Education, Federal Security Agency, Ray-Bell Films, Inc.
Summary:
Shows how to assemble broaching inserts in right- and left-hand toolholders, how to mount and adjust toolholders in the double ram; how to mount and adjust the work fixtures; how to set trip dogs for the ram stroke; how to measure the workpiece after trial broaching; and how to surface-broach on a double ram vertical broaching machine at a production rate.
Shows various types of micrometers; how to use a micrometer, read the barrel and thimble scales, check the accuracy of readings, and take care of the instrument.
