“…Forbush, 1937;Miehlnickel, 1938;Thompson, 1939;Duperier, 1946). It is noteworthy that now, more than four decades later, the existence and significance of a true sidereal diurnal anisotropy, with an amplitude of only a few hundredths of a percent, are still being debated (Jacklyn, 1963(Jacklyn, , 1965aChasson et al, 1965;Thambyahpillai et al, 1965;Baker et al, 1966;Kane, 1966a;Mabboux et al, 1968;Nagashima et al, 1968b;Sekido et al, 1968;Elliot, 1969;Jacklyn and Vrana, 1969;Somogyi, 1969;Swinson, 1969;Briggs et al, 1970).…”