m - HKU Libraries

"B'* Grade Standard £$£
(d) Piece 10 adjacent ends perfectly (a)
in 50 seconds.
(b) Start 10 adjacent ends perfectly (b)
in 47 seconds.
"C" Grade Standard
(a) Piece 10 adjacent ends perfectly (a)
in 60 seconds.
(b) Start 10 adjacent ends perfectly
in 55 seconds.
The above standards are based on
20's (30 Tex) cotton yarn and 7" lift
ring bobbin being used.
IV. Trade Tests: :
1. Piece ends and start ends skilfully 1. SH » £H.
within a certain time as specified ^IWlilgJt 1 o
in the Skill Standard The »***»««:
piecing should be correct and
clean.
2. Clean a ring spinning frame 2.
efficiently within a reasonable
time.
3. Differentiate between rovings of 3.
different blends and counts.
4. From a prepared board of yarn 4. $£—;
faults indicate the causes of the
faults.
5. Differentiate between different
types and numbers of ring
travellers.
6. Answer questions satisfactorily
on:
(a) The ^ purpose of ring (a)
spinning.
(b) The dangerous parts and (b)
safety devices on a ring
spinning frame.
(c) The names of the main parts (c) °
of a ring spinning frame.
(d) The effect of imperfect
cleaning work on quality and
machinery.
00 The effect of idle spindles (*) <
on production.
(/) The importance of making
good, clean and fast piecings.
(g) The reasons for separating
wastes.
81