The American annual of photography . Figure 3. Corpuscles in Motion Showing Their Form and Changeof Shape as They Pass Through the Capillaries. proven to be of value. By reducing or increasing the nominalspeed of taking we may see things hidden from the unaidedeye. 244 We may pass beyond the range of visibility to the ultraviolet region and record photographically some things wewould never see because within the range of visible light cer-tain substances do not differentiate from their surroundings. Slow motion pictures of athletic performances are of greatvalue for instructional purposes in a
The American annual of photography . Figure 3. Corpuscles in Motion Showing Their Form and Changeof Shape as They Pass Through the Capillaries. proven to be of value. By reducing or increasing the nominalspeed of taking we may see things hidden from the unaidedeye. 244 We may pass beyond the range of visibility to the ultraviolet region and record photographically some things wewould never see because within the range of visible light cer-tain substances do not differentiate from their surroundings. Slow motion pictures of athletic performances are of greatvalue for instructional purposes in athletic coaching. It takesone a long time to find out by eye what happens in the quickermotions of discus throw, ball pitching or tennis. Film a per-fect performance once and it may be repeated indefinitely with-out losing Ordinary Light. Polarized Light. Figure 4. Structure in Rock Section Revealed by Polarized Area in Each Photograph. (Microscopic.) In the field of geology, industrial development of mineraldeposits may hinge on what the microscope reveals. Thecamera will record what the scientist sees for the illustration ofhis report. A case in hand gave proof of the presence ofcertain minerals when photographed in polarized light, whileother methods of determination had given a negative answer.(Figure 4). From these few illustrations we can see that photographyis a potent tool of science, recording where nothing else canrecord; giving in a flash a faithful reproduction of intricatestructure where hours of labor at drawing could not interpret;telling quickly the facts where chemical analysis or physicalexamination would fail. 245
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
