NDLI: Symmetry Aspects Of M.C. Escher's Periodic Drawings

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Symmetry Aspects Of M.C. Escher's Periodic Drawings

Content Provider	Semantic Scholar
Author	Macgillavry, Caroline H.
Copyright Year	1976
Abstract	these measurements are made by a manual device with digital counters; each measurement must be recorded by hand and combined to yield orientation parameters. This procedure is tedious and subject to human error at several stages. We have devised a more efficient procedure using a system which is commonly employed for the measurement of contour lengths of DNA molecules photographed in the electron microscope. We illuminate the oscillation photograph from below or project it from above with a photographic enlarger. Each fiducial mark and reflection is located with the magnifying cursor of the digitizer and, upon command, its film coordinates are transmitted to the calculator. The resolution of each measurement is 250 #m. The calculator is programmed to list each pair of coordinates and to calculate the correction constants which describe the crystal orientation (Nyborg, Wonacott, Thierry & Champness, 1975). The reproducibility of these numbers is approximately 50 #m. All of the measurements and calculations required to process a single film can be completed in less than four minutes. Further details, including a listing of the program, are available from the authors.
Starting Page	91
Ending Page	91
Page Count	1
File Format	PDF HTM / HTML
DOI	10.2307/1571914
Alternate Webpage(s)	http://journals.iucr.org/a/issues/1976/05/00/a13001/a13001.pdf
Alternate Webpage(s)	http://journals.iucr.org/a/issues/1976/05/00/a13003/a13003.pdf
Alternate Webpage(s)	http://journals.iucr.org/j/issues/1976/05/00/a13993/a13993.pdf
Alternate Webpage(s)	http://www.gbv.de/dms/hebis-darmstadt/toc/91585406.pdf
Alternate Webpage(s)	http://journals.iucr.org/a/issues/1976/05/00/a13002/a13002.pdf
Alternate Webpage(s)	https://doi.org/10.2307/1571914
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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