Journal and Proceedings of
The Royal Society of New South Wales
Volume 105 Parts 1 and 2 [Issued 16 April 1973]
CONTENTS
| AUTHORS & TITLES | PAGES |
| Burman, R.R. On the Motion of Particles in Conformably Flat Space-Times | 1-2 |
| Burman, R.R. Astronomical Objects Embedded in Matter. I External Metrics | 3-8 |
| Burman, R.R. Astronomical Objects Embedded in Matter. II Light Tracks | 9-14 |
| Sims, K.P. Occultations Observed at Sydney Observatory during 1971 | 15-18 |
| Ashley, P.M. and Irving, A.J. A Gabbro-Troctolite-Anorthosite Intrusion at Dirnasseer, near Temora, New South Wales | 19-26 |
| Ward, C.R. Ripple-Drift Cross-Lamination in the Hawkesbury Sandstone, New South Wales | 27-29 |
| Pickett, J. Late Devonian (Frasnian) Condonts from Ettrema, New South Wales | 31-37 |
| Gibbons, G.S. and Gordon, J.L.. A Study of Root Concretions at Kurnell, N.S.W. | 39-42 |
Vol. 105 Pts 1-2, pp.1-2
On the Motion of Particals in Conformably Flat Space-Times
R.R. Burman
Abstract. The Papapetrou-Pirani equation of motion for a spinning particle is specialized to conformably flat space-times. In de Sitter space, this equation, and the DeWitt-Brehme-Hobbs equation of motion for a non-spinning charged particle in an electro-magnetic field with radiation reaction allowed for, have the same forms as in special relativity.
Vol. 105 Pts 1-2, pp.3-8
Astronomical Objects Embedded in Matter. I External Metrics
R.R. Burman
Abstract. This series deals with bodies, which may be charged, embedded in matter which has a density varying with the radial coordinate. In this Part, the external material is represented by uncharged incoherent matter; static spherically symmetrical integrals of the Einstein-Maxwell equations are obtained with one of the functions in the metric left arbitrary. For the case of homogeneous external matter, one integral is obtained in closed form and expansions of the other integral are given which are valid near the central body, if it is uncharged, or well away from it; for an uncharged central body, the second integral is also expressed in closed form.
Vol. 105 Pts 1-2, pp.9-14
Astronomical Objects Embedded in Matter. II Light Tracks
R.R. Burman
Abstract. This paper deals with the space-time region, outside a static spherically symmetrical object, occupied by a continuous distribution of matter. Integrals of the Einstein-Maxwell equations, with one of the functions in the metric left arbitrary, are used to investigate light tracks; conditions for the existence of circular photon orbits are obtained. Particular attention is paid to the case in which the external matter is homogeneous and the central object is uncharged.
Vol. 105 Pts 1-2, pp.15-18
Occultations Observed at Sydney Observatory during 1971
K.P. Sims
[No Abstract]
Vol. 105 Pts 1-2, pp.19-26
A Gabbro-Troctolite-Anorthosite Intrusion at Dirnasseer, near Temora, New South Wales
P.M. Ashley and A.J. Irving
Abstract. The Dirnaseer basic intrusion, consisting of crudely layered gabbroic, troctolitic and anorthositic rocks, is interpreted as representing the exposed portion of a high level, boat-shaped magma chamber. Marginal doleritic rocks are interpreted as a chilled facies of the intrusion, and xenoliths of granular plagioclase-olivine-clinopyroxene hornfels are considered to be recrystallized fragments of previously emplaced gabbros. The rock displays tholeiitic affinities, being relatively poor in Ti, P, K and Na and relatively rich in Mg. Apart from some chemical differences, the Dirnaseer intrusion shows particular similarity to the Somerset Dam Intrusion and Eulogie Park Gabbro in Queensland, and has many features in common with other basic intrusions. New data are also given for a quart-bearing two-pyroxene gabbro from Wyalong and a metadolerite from Reefton, New South Wales.
Vol. 105 Pts 1-2, pp.27-29
Ripple-Drift Cross-Lamination in the Hawkesbury Sandstone, New South Wales
C.R. Ward
Abstract. Ripple-drift cross-lamination (climbing ripples) is present in the bottom-set of a cross bed unit in the Hawkesbury Sandstone, west of Garie, N.S.W. The structure has been formed by a combination of vertical setting and traction transport of coarse grained sand in a manner similar to that described by Boersma (1967) for modern sediments of the Rhine delta in Holland. The direction of flow was opposite to that of the adjacent cross bed unit because of the influence of a zone of reverse circulation in the bottomset area.
Vol. 105 Pts 1-2, pp.31-37
Late Devonian (Frasnian) Conodonts from Ettrema, New South Wales
John Pickett
Abstract. Conodont faunas from two localities are discussed and illustrated. Their age is considered to be late Frasnian (toIδ). One new subspecies, Polygnathus nodocostatus ettremae, is described.
Vol. 105 Pts 1-2, pp.39-42
A Study of Root Concretions at Kurnell, N.S.W.
G.S. Gibbons and J.L. Gordon
Abstract. At Kurnell, 16km. south of Sydney, N.S.W., there is a large wind-blown dune area consisting of sand blown from an adjacent beach. Within these dunes can be seen old soil profiles with which are associated tube-concretions of carbonate-cemented quartz grains, apparently following former root systems. Experiments indicate that the concretions develop over a long period of evaporation of carbonate-saturated ground water in the region of the decaying root.