Journal and Proceedings of
The Royal Society of New South Wales
Volume 102 (for 1969) Part 2 (issued May 20 1970)
CONTENTS
| AUTHORS & TITLES | PAGES |
| Robertson, W.H. Precise Observations of Minor Planets at Sydney Observatory during 1967 and 1968 | 109-117 |
| Sims K.P. Occultations Observed at Sydney University during 1967-68 | 119-121 |
| Klotz, A.H. A Note on Kinematical Derivation of Lorentz Transformations | 123-124 |
| Klotz, A.H. Lorentz Transformations and Invariance of Maxwell's Equations | 125 |
| Bambrick, Susan. The First Commonwealth Statistician: Sir George Knibbs | 127-135 |
| Goodwin, Robert H. Triassic Stratigraphy - Blue Mountains, New South Wales | 137-148 |
| Guy, Brian B. Granitic Development and Emplacement in the Tumbarumba-Geehi District, N.S.W. (ii)The Massive Granites | 149-156 |
vol. 102 pt 2, pp.109-117
Precise Observations of Minor Planets at Sydney Observatory during 1967 and 1968
W. H. Robertson
The programme of precise observations of selected minor planets which was begun in 1955 is being continued and the results for 1967 and 1968 are given here. The methods of observation and reduction were described in the first paper (Robertson, 1958). All the plates were taken with the 23 cm. camera (scale 116" to the millimetre). Four exposures were made on each plate. The plates for 4 Vesta were taken with a coarse wire grating placed in front of the lens, giving first order spectra which are 2-3 magnitudes fainter than the central image and displaced 0.32 mm. from it in an east-west direction. The spectra were measured for the planet and the central image for the stars.
vol. 102 pt 2, pp.119-121
Occultations Observed at Sydney Observatory during 1967-68
K.P. Sims
[No summary]
vol. 102 pt 2, pp.123-124
A Note on a Kinematical Derivation of Lorentz Transformations
A. H. Klotz
[First paragraph]
1. There is a close analogy between the assumptions of Milne's Kinematical Relativity (Milne, 1948) and the k-calculus with the help of which Bondi (1964) derives Lorentz transformations. In both accounts a rigid measuring rod is replaced by measurements of distance carried out by means of light signals. This is particularly appropriate when "distant " events are being observed since a "measuring rod" can, at best, be transported only to the nearest celestial bodies.
vol. 102 pt 2, p.125
Lorentz Transformations and Invariance of Maxwell's Equations
A. H. Klotz
[First paragraph]
It is well known that one of the fundamental assertions of the Theory of Special Relativity is the invariance of Maxwell's equations under Lorentz transformations in a flat space time continuum. The converse of this result is that if Maxwell's equations are invariant under a certain general class of linear transformation then the latter belong necessarily to the representations of the Lorentz group. Validity of the converse is less frequently realized. We shall prove it in this note.
vol. 102 pt 2, pp.127-135
The First Commonwealth Statistician: Sir George Knibbs
Susan Bambrick
The Constitution of the Commonwealth of Australia empowered the national government to engage in census-taking and statistical compilation and publication, and a Census and Statistics Act was passed in 1905, authorizing the creation of the Commonwealth Bureau of Census and Statistics. In the following year its work began under the direction of George Handley Knibbs.
vol. 102 pt 2, pp.137-148
Triassic Stratigraphy - Blue Mountains, New South Wales
Robert H. Goodwin
Abstract. Geological mapping in the Blue Mountains revealed previously unknown Narrabeen Group sediments in Glenbrook Creek and a modification of the previously recognized western boundary of the Hawkesbury Sandstone. Examination of the Hawkesbury Sandstone-Narrabeen Group stratigraphic boundary indicates that the Burralow Formation (upper Narrabeen) thins and undergoes a facies change in a westward direction. At the westernmost extent of the Hawkesbury Sandstone, between Hazelbrook and Lawson on the Great Western Highway, the Burralow Formation, although probably still present, cannot be distinguished from the Grose Sandstone. Within the massive Grose Sandstone there are two extensive continuous reddish-brown claystone horizons which are used for subdivision aad marker horizons.
vol. 102 pt 2, pp. 149-156
Granitic Development and Emplacement in the Tumbarumba-Geehi District, N.S.W. (ii)The Massive Granites
Brian B. Guy
Abstract. The massive granites of the Tumbarumba-Geehi district may be classified into three groups — the Khancoban, Mannus Creek and Dargals granites — on the basis of spatial distribution. The emplacement of Khancoban and Mannus Creek granites post-dates the regional metamorphism of the district although mineralogically and chemically such rocks bear some similarity to the foliated Cooma-type granites that are considered to have been produced in the regional metamorphic processes (Guy, 1969b). Chemically such massive granites have high CaO and NaO contents and are considered to have developed either at the same time as the foliated granites or by a regeneration of such granitic material.
The Dargals granites are leucocratic with more than 80% normative Q+ Or+ Ab. It is considered they have migrated far from their position of origin, but may have been produced during the cycle of development of the other massive bodies.