176 WILLIAM M. HAMLET. 
ON A NEW BLOWPIPE ARRANGEMENT. 
By Witiuiam M. Hamzet, F.1.c., Government Analyst, N.S.W. 
[Exhibited before the Royal Society of N.S. Wales, August 3, 1892.] 
THE blowpipe consists of the usual fine platinum jet, fastened to 
a brass tube jointed on to a sliding rod, inserted into a brass stand 
shown in the wood-cut, by which means the jet may be inclined 
to any desired angle. 
\ 
=a 
a 
WN 
i 
3 _———— Ss ‘ 
a 
| 
The air-blast is urged by means of one of the ordinary caoutchouc 
spray producing balls obtainable at any pharmacy, these balls are 
attached to a piece of capillary lead-glass tube, over one end of 
which a piece of oiled silk is tightly tied, thus forming a valve 
that only opens inwards and prevents any back flow of air: the 
valve is passed through a cork and inserted into the inlet of an | 
air-tight chamber made of tin plate, and measuring 10” x 8” x 1”, 
this air chamber is placed out of sight by screwing on to the under- 
side of the blowpipe table, which measures 18” x 10”, and stands 
on four legs 14” high. 
To the left of the front is an upright frame made to hold a sheet 
of glass six inches square; into the groove made in the frame, 
ruby, violet, green and colourless glasses may be inserted as 
wanted. Ata point 2” from the left edge is a brass rod 6” high 
