630406Eclipse4_p4

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Eclipse Bulletin No. 4 cont'd,

5. SPECTROSCOPIC PHOTOGRAPHY

   (b) Spectrum of Corona. Photographs of the spectrum of the corona require a
   spectroscope with a slit, attached to a telescope. The procedure is rather complex
   and will be described in a bulletin covering special projects.

Motion Pictures.

       Motion pictures can be made of all aspects of the eclipse and the procedure
does not differ materially from that used for still pictures. Again, a telephoto lens
should b& employed, and filters are necessary during the partial phases. The exposure
tine of the film, running at 16 frames per second, is aoout 1/30 second.

5. ONRUSH OF SHADOW

       Photography of tie onrush is interesting and valuable. The observer should be
   on a slight elevation, with his camera mounted on a tripod. The moment the Shadow
is seen in the distance, tie camera should be started, The shadow moves very rapidly
acroSs the surface of the earth, and this speed can be measured if the photographer
measures the distance (in feet or tiles) betweefl two landmarks he has photographed,
and notes the time for tie shadow tG travel, that. dIstance (measured in 16ths of a
second on the developed film) and the direction of travel relative to the line
joining the landmarks.

REPORT FORMS

Photographs of most aspectS of the solar eclipse can be made with modest
equipment.  If the photographer is careful to record all the fletails of the exposures
he has made, many of these will not only be of lasting interest but will also be
valuable for making measurements. The attached report form, has spaces for information
on all types of photographs. It is hoped tbat those attempting photography will fill
out and return this form, if possible with copies of his results, to the National
Co-ordinator.

                                *    *    *    *    * 


Additional copies of this bulletin and the report form are available on
request. 


                                     Kenneth Chalk 
                                     Member of National Eclipse Committee

                                     Isabel K. Williamson	
                                     National Co-ordinator 1963 Eclipse
                                     5162 Belmore Avenue,	
                                     Montreal 29, Canada

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