214 E. W. Morley—Apparatus for Rapid Filtration. 
Art. XXIV.—The discovery of a new Double Star, B Delphini; 
by S. W. BurnHAM. 
EXAMINING £ Delphini with my 6-inch Alvan Clark refrac- 
tor on the evening of August 8th, I saw at once that it was a 
very close double star, and with a power of 410 it was well seen, 
although too close to be separated with an instrument of that 
as No. 35 of his Class IV. Struve measured it in 1829, and 
entered it in the great Dorpat Catalogue (Mensur Micrometrice) 
as No. 2704. Sir John Herschel also noted it in his Fourth 
Catalogue (Memoirs of the Royal Astronomical Society, vol. iv), 
and added a more minute companion, rated by him as 14 mag., 
at a distance of 18”; and both were measured still later by Ad- 
miral Smyth (Oycle of Celestial Objects). The well known double 
star observer, Baron Dembowski, measured the principal com- 
panion in 1864, giving its distance as 34°64. None of these 
observers seem to have even suspected the duplicity of the 
bright star notwithstanding very much larger instruments were 
used than the one from which it was detected. Possibly it 
may prove to be a binary of long period, and single during the 
earlier observations. It would be very desirable to get meas- 
ures of it during the present season. — 
Chicago, Aug. 12, 1873. 
niceties 
Art. XXV.— Apparatus for Rapid Filtration; by E. W. MORLEY. 
received by other chemists, that ‘an account of it may be of 
some value to those who employ Bunsen’s method of filtration. 
