Start Over

Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000623
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

0+20KV •HOOOV -300V o All thyrotrcns 2D21 Fig. 15. Circuit for the generation of rectangular high-voltage pulses. Fig. 16. Detonation of a small explosive charge, photographed with the Kerr-cell shutter shown in Fig. 15, with an exposure time of 0.5 jisec. simple method can be used to synchronize the Kerr-cell shutter with a guided spark or similar source and to open the shutter during the whole duration of the flash (Fig. 17). This circuit puts to advantage the time-lag of a subsidiary guided spark G. The Kerr cell is connected between the control electrode of the main guided spark Gi and the anode of the subsidiary guided spark G2. The shutter opens up when the control electrode of GI is grounded, i.e., before the flash, and closes down when Gz breaks down after the most luminous portion of GI'S flash. The photographs in Fig. 18, which shows a 20-mm shell in flight, were obtained under these conditions; triggering was achieved by short-circuiting two aluminum sheets separated by a sheet of paper. Four-Spark Generator for Shadowgraphic Exposures It is clear that the basic spark and delay circuits discussed above can be combined in many ways to obtain highdefinition multiple exposures at rates up to several million frames/sec. Higher rates are seldom if ever justified in practice. Among these many possibilities, we have chosen to describe here two instruments which we have already manufactured for several outside users: a 4-spark generator for shadowgraphic 614 May 1953 Journal of the SMPTE Vol. 60