ABSTRACT OF PROCEEDINGS. KXXIX. 
Acting-Prof. J. A. ScHoFIELD— 
“Vacuum Tubes, Rontgen Ray Tubes, Glew’s Scintilloscope 
and Specimens of Radium Bromide.” 
“‘ Copper Mirrors on Glass.” 
“Combined Chemical and Assaying Balance.” 
Maximum load to grams or 150 grains, sensitive to ‘000025 grams or 
‘0004 grains, with platinum crucible weighing about 5 grams for use 
with the balance. 
(In the small Chemical Lecture Room.) 
Mr. R. C. Simpson, Lecturer in Charge, Dept. of Electric. 
Engineering and Physics. Apparatus made by the staff 
or students at the Technical College, Sydney— 
“ Variable Standard of Self Induction.” Range ‘25 to ‘89, 
Henry. 
«‘ Standard Cells.” 
“Two Kelvin Balances of different Ranges.” 
Mr. W. S tape, Architect, A collection of photographs by the 
exhibitor.— 
“Views of the Hawkesbury River ”’— 
1, As seen from Berowra, towards Peat’s Ferry; Casua- 
rinas in the foreground. 
. Near Windsor, study of Weeping Willows. 
- Old Mill below Wiseman’s Ferry, 
. Towards Berowra,’ the track to Tootagraragie. 
. Barr Island, 
. Berowra Creek, 
. Sandstone Bluff, at head of Wiseman’s Ferry. 
. Entrance to Macdonald River, near its confluence with 
the Hawkesbury at Wiseman’s Ferry. 
g. Wiseman’s Ferry. 
10. One of the Upper Reaches of the Hawkesbury, mid- 
way between Windsor and Wiseman’s Ferry. 
CON DAMN > W ND 
11. Berowra Mangroves. (Avicennia.) 
12. Near Berowra, the Glen light. The champion picture of 
the Photo. Exhibition of the Railway Institute, rgo6. 
13. Aborigine and maize patch, Hawkesbury. 
