The times. [volume] (Washington [D.C.]) 1897-1901, 1900-05-28

corona with the light furnished by the cor
onium line 147& both the red and violet
ends Of the spectrum being completely alb
sorbed by a copper solution with which the
color screen is filed.
DR.. Chase. OF Yale University, will make
observations with a six-inch prismatic
camera which gives the brilliant spectrum.
extending from the red well up into the
violet. The most important observation.
perhaps, undertaken by the Observatory
expeditions is that of the concave grating
and the grating objective in charge of the
associate members of the expedition from
Johns Hopkins physical laboratory. These
gratings are the most powerful instru-
ments of the kind ever used before in
eclipse work and represent in their con-
struction and mounting a distinct advance
over any other work of this character ever
before undertaken.
The Observatory was fortunate in Sc
curing oppcrtuIely gratinss having the
peculiar character of concentrating all the
light OF the various order of spectra in the
first spectrum, thus giving out a bril-
liancy which exceeds that of any possible
combination of prisms. The mounting of
these gratings for the special work of :he
eclipse is due to the ingenuity of Mr..
Jewell, whose experience and skill in this
matter are well known throughout the
astronomical world.
observations In Georgia.
The two other expeditions from the
Observatory are in Georgia. One is near
the central line OF the totality belt at
Barnesville, the other near the northern
limit Of totality at Griffin. The Barnes
Vile station is in the immediate charge Of
Prof. Milton Updegraff, assisted by the fol-
lowing members Of the Observatory staff:
DR.. T. J. ]. See, G. A. Hill. F. H. Littell.
@. H. Peters, and NJ. A. Coulon. The
Observatory is fortunate In having Sc
cured. at GAINESVILLE Prof. J. R. Eastman.
now of Andover. n. H. Prof. Eastman is
q retired Government officer. having been
formerly Astronomical Director of the
Naval Observatory. He is thoroughly con-
rersant with every detail OF the eclipse
work. has vast experiences in this parti-
cular field, and will prove valuable addi-
tion to the Government expedition at
Barnesville. Prof. H. C. Lord, in charge of
the only spectroscope observations at this
station. will use sHtless spectrograph de-
signed and constructed by himself. Mr..
Theodore C.. Schneider, the instrument
maker of Johns Hopkins physical labora-
tory. and Mr.. C. A. Post, of New York
City, are associated members OF the ex-
pedition.
The work at the Griffin station will be
very VI lue same dS tudl
at Pinehurst. and will consist Of observa-
tions with powerful gratings. which, like
those of other stations, are the products
Of the Johns Hopkins laboratory. The
first Of these instruments is in charge
OF L. E. Jewell. of Johns Hopkins
University and DR.. S. A. Mitchell. of
Columbian University. New York. The
second is in charge of Prof. Henry
Crew. of the Northwestern Univer-
sity, Of Evanston, ILL.,. and DR.. Tatnall,
his COLLEAGUE. of the same university. The
third lis trument is in charge of Dr. Hum
phreys, of the University of Virginia, as
sisted by DR.. Dinwiddie, of the same uni
versity.
1t is worthy of note and remarkable
indication of the work Of the Johns Hop
kins University that all the specialists en-
gagged in this important work OF investiga-
tion of the spectrum and the suns atmos-
phere are, like the instruments which are
used, the product of Johns Hopkins phys
ical laboratory. These were not invited
as associate members on account of this
fact, but because Of their recognized abil-
ity in this line of research.
The Photographic work of the Barnes
Vile station will consist of observation
with various sized instruments ranging
from the iO-foot photo-heliograph lens
down TO the Dallmeyer camera of 3 1-2