Clinch Valley news. [volume] (Jeffersonville, Va.) 18??-2019, 1900-05-18
THE ECLIPSE
OF THE SUN
Opportunity for Photo
graphic Skill.
BELT OF COMPLETE ECLIPSE
The Totality Stretches From
New Orleans Northeasterly

passes out upon the Atlantic.
"Are you gong to try shot at
the eclipsei"
This is the upp ermost question
in amateur Photographic circles
throughout and adjacent to The
belt of totality ofthe comlns total
observation of the sun, which oc
ours Monday, May 2S. Here in
Washington the eclipse will be al
most total, ond only II thin cres-
cent of the shining horb will be
visible at this period pr h. nhaS,.
With triple coated, non ha allation
plate aud an exceptionally rapid
exposure as comparatively good
and quite valuable picture of the
phenomenon may be secnred:
There are many Washington
amateurs who are gong To take
advantage OF the cheap rates of.
iered by the railroa : aud Journey
TO some point along the oelt of
totality which stretches from New
Orleans northoasterlN tn Norfolk
Va, where 1t passes uur upon the
Atlantic. a majority will natu.
rally gather in the NiainiiN of Nor
folk, that point Offering the best
advantages aud convenience OF
, any of the nearby localities includ
ed within the line of absolute OBJ
scurement.
Amateurs are perhaps the more
interested IN the coming eclipse 10y
reason OF the recorded iact that
the best photograph OF the coming
j. eclipse in India IN 1898 was ob
tained 10y an amateur with hom,
made camera. His viaws of the
phenomenon were accepted bv all
the scientific Institutions of the
world in preference 90 those made
by Professionals with larger aud
superior Instruments
1t would be advisable fnr The
local manipulators of the camera
to eoniine their ellor's 10 he grp
tesquc aud exceptional, Interest
In ell, cts produced u ,o' "dit ~
objects. The peculis + drlt's'nu of
the light when the "r!ipS" ~ al
most total tends to many weird
results. The most noticeable af
these will be the half moon spots
thrown upon the ground wherever
the rays forco their way through
the foliage OF trees. Ofton objects
are srreaked with peculiar hight,
The close observers will fad many
things to photograph during the
prevalence of the shadow.
For photographing the eclipse
1t is advisable, of course, and prac.
tically necessary, that the e-photo
: lens shall be used, else the object
Q of the sun will appear as but dot
= upon the plate. 1t is estimated
7 that with a tele-phOtO Tense the
/ diameter of the main body OF the
. sun impression upon the plate will
{ be one one-hundredth of an inch
to each inch of focus, hence with
a camera of twenty inches feeal
t length n picture of the sun ons
5 fifth of an inch In diameter will
8 lie obtained. The diaincter of the
/. surrounding aurora or coroba will
be four times as great or four
: iifths of an inch in diameter. The
: large cameras ererected at the
1 United States naval observatory
Georgetown Heights, and as the
| Smithsonian Institution have a
focal length of abont twenty feet,
: so that it will be seen that q pic
4 ture of the partial eclipse of about
c two and one half inches in diameter
s will be secured.
To secure good picture Of the
:, corona the exposure with medium
i diaphragm stop should be between
r. tSo and three seconds. The camera
a should be rigidly fixed and a plate
u of normal sensitiveness nsed. An
;, excellent focus may be had by
:. bringiI G he camera to bear upon
Z a well defined object quarter of a
a mile away.
al Tho Irni,ad S+.tos o.,t -