Book Reviews

The Equality of States in International Law. By Edwin De Witt Dickinson. (Cambridge: Harvard University Press, ig o. Harvard Studies in Jurisprudence, Vol. III.) Pp. ix, 424

The Naval Profession: Challenge and Response 1870-1890 and 1950-1970

History is important because it gives us a perspective from which to view our own concerns and problems which are frequently similar to those of other times. The naval profession faced similar problems in the two periods 1870-1890 and 1950-1970. In both periods the Navy had to develop a rational policy for the employment of the fleet as well as the means to make the fleet effective

Abel Parker Upshur and The Dignity of Discipline

The political process of the American people has, through its custom of rewarding party constancy I placed individuals of widely varying aptitudes, abilities and interest in the office of the Secretary of the Navy. Despite the gross ineptitude of some, the short tenure of office of others, and the uninformed minds of a few, the mantel of the secretaryship of the Navy has fallen on the shoulders of some whose initial maritime acumen was relatively slight but which broadened and deepened in the furnace of accepted responsibility and on the forge of harsh deman

Conceptual Problems in Twentieth-Century Maine Maritime History

The article discusses the areas of research in twentieth-century Maine maritime history and available source material for that research

Neutrality of British Dominions

The recent Cannes conference has revived the question of the -international status of the British dominions. Article IV of the proposed Anglo-French Alliance provided that the present treaty shall impose no obligation upon any of the dominions of the British Empire unless and until it is approved by the dominion concerned. In short, the dominions were left free to pursue an independent foreign policy in European affairs

Accretion stream mapping with genetically modified "fire-flies"

We apply an eclipse mapping technique using `genetically modified fire-flies' to the eclipse light curves of HU Aqr and EP Dra. The technique makes as few assumptions as possible about the location of accretion stream material, allowing the emission to be located anywhere within the Roche lobe of the white dwarf. We model two consecutive eclipses in the UBVR_c band for HU Aqr, and four consecutive `white'-light eclipses for EP Dra, to determine the changing brightness distribution of stream material. We find fire-fly distributions which are consistent with accretion through a curtain of material in both HU Aqr and EP Dra, and show that the previously assumed two part ballistic and magnetic trajectory is a good approximation for polars. Model fits to the colour band data of HU Aqr indicate that the material confined to the magnetic field lines is brightest, and most of the emission originates from close to the white dwarf. There is evidence for emission from close to a calculated ballistic stream in both HU Aqr and EP Dra.We propose that a change in the stream density causes a change in the location of the bright material in the accretion stream in EP Dra.Comment: accepted for publication in MNRA