28 EEPORT — 1 888. 



The unit of momentam on the C.G.S. system of units, i.e., the 

 momentum of one gramme moving at one kine, to be called one Bole. 



The unit of pressure on the C.Gr.S. system of units, i.e., the pressure 

 of one dyne per square centimetre, to be called one Barad. 



The Committee do not recommend that any additional names be 

 given to English units. 



They ask to be reappointed, as they think that there are some other 

 units upon which there is prospect of agreement as to the names to be 

 recommended. 



Fourth Report of the Committee, consisting of Professor Balfour 

 Stewaet (Secretary), Professor W. GtEtlls Adams, Mr. W. Lant 

 Caepentee, Mr. C. H. Carpmael, Mr. W. H. M. Cheistie (Astrono- 

 mer Royal), Professor Gr. Chetstal, Captain Ceeak, Professor Gr. H. 

 Daewin, Mr. William Ellis, Sir J. H. Lefeot, Professor S. J. 

 Peeey, Professor Schustee, Professor Sir W. Thomson, and Mr. 

 Gr. M. Whipple, appointed for the yurpose of considering the 

 best m,eans of Comparing and Reducing Magnetic Observations. 



Since their last report the Committee have to record the death of their 

 Secretary, Professor Balfour Stewart, whose loss will be deeply felt in the 

 scientific world, especially by those who are engaged in researches in 

 terrestrial magnetism and in the work of magnetic observatories. A 

 meeting of the Committee was held on February 2, 1888, at which Pro- 

 fessor W. Grylls Adams was requested to act as Secretary to the Com- 

 mittee, and to forward to the directors of magnetic observatories copies of 

 the third report of the Committee, calling special attention to the para- 

 graphs relating to the determination of scale coefficients. 



At the second meeting of the Committee on July 11, 1888, Mr. W. L. 

 Carpenter handed to the Committee a paper which had been prepared by 

 Professor Balfour Stewart on a comparison between the wind values and 

 declination disturbances at the Kew Observatory. The Committee have 

 thought it right to recommend that this paper and the table accom- 

 panying it be printed as an appendix to the report. 



The Committee learn that all the scientific material found among Dr. 

 Stewart's papers is in the possession of Professor A. Schuster. Professor 

 Schuster has continued his reduction of the diurnal variation of terrestrial 

 magnetism and has nearly completed a paper on the subject, which he 

 purposes to present to the Royal Society. 



A paper has also been communicated to the Committee by Major 

 Dawson on magnetic observations taken at Fort Rae in 1882-83, which 

 is printed as Appendix II. to this report. 



Appendix I. Eesults of a companson between the wind values and declination 

 disturhances at the Kew Observatory. By Balfour Stewakt, M.A., 

 JjL.I)., F.B.S., and William Lant Carpenter, B.A., B.Sc. 



In a note communicated to the Royal Society on February 11, 1885, we 

 gave the results of a preliminary comparison between the dates of cyclonic 



