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Feb., 1930] PROGRESS REPORT 249
Library prints on 16 mm. film are available of pictures made with Jenkins' speed camera which operate at 3200 pictures per second.262 Bird studies have been made with an amateur camera which operates quietly enough so that the birds become accustomed to the motor noise.253 Motion pictures taken by an amateur of an auto accident were introduced as evidence in an Australian court at the request of the justice.254 A correspondence school in electricity is being taught wholly by the use of 16 mm. pictures.255
B. Color Processes.
A new projector for Kodacolor films has been issued by Bell & Howell.256 The lamp operates at 5 amperes and is fitted with a variable resistance. Two patents257 have appeared on the use of lenticulated films. One is related to the use of a five banded filter which comprises one green, two red, and two blue areas. The other patent covers the use of an optical system for lenticulated films which is designed for use with curved gates, compensating lenses usually required in projection being avoided.
A projector268 for projecting natural color pictures has t been patented. The film passes between condensing and projecting lenses. A shutter and a rotatable color screen, (having several different color areas) are positioned between the film and the condensing lens.
VII. MISCELLANEOUS USES, STATISTICS, NEW BOOKS
A psychologist at Columbia University has reported on a two year investigation made on the influence of motion pictures on crime.259 The results indicated that most children remembered very little detail of the picture and were unsympathetic with the wrongdoers. Only 5.2 per cent of the 150,000 patrons were under 21 years old.
Over 250 million persons see motion pictures weekly throughout the world according to W. H. Hay's annual report.260 Over 23,000 controversies were arbitrated by film boards during 1928, only 28 claims requiring the services of a seventh arbitrator.
Export of positive and negative film from the United States fell off 10 million feet in 1928 when 222 million feet were shipped out compared to 232 million feet in 1927. Latin America continues to be the largest consumer; Europe is next.261 A more recent report by Golden262 indicates an increase in total film exports for the first six months of 1929 which is accounted for largely by the demand for positive prints in Europe. The totals are 121,810,453 linear feet for