292 PROCEEDINGS, 
Selfe, “sci C.E.—Steam engine indicator for giving continuous 
di 
Gvcenies Paadoadic F.R.S.—Portable assay balance, improved 
by Mr. J. M. Smith, of Sydney. 
Technological Museum lent an oe collection of exhibits. 
Etchings of objects of art, 1st se 
‘Tl Tesora di san Marco'i in Vénisia” 1 vol. 
“The art of the old English potter,” 1 vol. 
“ Ornaments of domestic aninieey : apne = 1 vol. 
“ Ladies’ old-fashioned shoes,” 1 ¥ 
ypore en Ge Oe 
The following is a list of Prof. “Threlfall’s exhibits and demon- 
strations -—— 
d.. An experiment for a rough ~ of the resistance 
The method depends on an nuance of the induction 
ce. 
The sheory is complicated, but a statement will be 
up near the apparatus. 
The mare is still being experimented o 
Il A galvanometer, designed in the Caveudiah Laboratory, 
ambridge, for measuring induction co-efficients. The 
peculiarities ar are— 
(a) Sensitiveness is got by an astatic arrangemen 
(6) The — arts are arranged, so that the “ moment 
inertia” may be easily found. 
(c) Relieve of winding is small. 
(d) Co-efficient of self-induction is very small. 
(e) Adjustments are provided for slanae the coils readily 
in the magnetic meridian, and measuring the torsion 
co-efficient of the suspending fibre. : 
Lie A kathetometer, designed by Prof. Poynting, < Bir- 
mingham, and manufactured by the “C pes a 
Scientific messes Company.” the 
improvements a 
(a) as = does a: support any of the weight of the 
ing 
() The taldsees always moves parallel to itself because it is 
pressed at four points on a truly cylindrical surface. 
(c) The oo of the telescope moves for focussing, 40 
eye piece ; this enables the line of oelineation 
to be ae aintained in space with great ac curacy. a 
(d) The — = — directly by means of a microscope aM 
(e) The 3 aPingemenks for levelling are very perfect. 
