14 H. A. LENEHAN. 
curial apparatus the time of totality was divided as nearly 
as might be to obtain duplicate plates along the ecliptic 
in the vicinity of the sun. The exposure with.the spec- 
trograph lasted throughout totality, except for a second 
or two at the beginning and the end. No detailed study 
of photographs is made at an eclipse camp. This requires 
the resources of measuring-engines, microscopes, compari- 
son-plates, and other records. At the observing station 
the one object is to bring out all the detail the plates will 
yield and fix them against the chance of accident from hght 
or chemical change. 
Professor M. Moye at Alcala de Chisvert, a little town 
on the east coast of Spain, was favoured with a clear sky, 
observations were restricted to the shadow bands, and he 
describes them; they were greyish ribbons, not black, 
tolerably distinct and wavy: 
“T noticed their direction from 8.W. to N.E. and their motion 
perpendicular to this, 7.e., from N.W. to 8.E., both before and 
after totality. The shadow bands reminded one of a rope tied at 
one end and made to wave by the hand at the other end. At the 
totality, ight was surprisingly bright, had no dithculty in sketch- 
ing or reading small letter press, features of landscape, details of 
railway engine; divisions of watch easily seen. Owing to the 
general illumination, decidedly lighter than a full moon night, I 
was unable to see any star or planets, with the exception only of 
Venus. The eclipse wind was very noticeable, coming to a perfect 
calm some minutes after totality; temperature in shade fell 
about 5° Fahr.” 
Observations of these shadow bands hitherto made have 
been quite discordant, and the cause of the phenomenon is 
not known with certainty, although there are theories, one 
of these assumes that the bands are a diffraction effect 
when the sun becomes a narrow strip; another is described 
by Professor Cleveland Abbe, this, he says, should not be 
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