Direct and indirect system and find the count and thickness of yarn

1. MATH'S PRESENTATION
conversions
Slides prepared by :Alina Afzal

2. INDIRECT SYSTEM
 Count
 Thickness
 Higher the count lower the thickness.
 In indirect system c=l/w
 (Length per unit mass)

3. DIRECT SYSTEM
 Count
 Thickness
 Thicker the yarn higher the count.
 In direct system c=w/l
 (mass per unit length)

4. INTRA CONVERSIONS & INTER CONVERSIONS
 Inter - ( from outside )
direct – indirect relation .
o Intra – (with in)
o Direct-direct relation.
o Or
o Indirect – indirect relation.

5. CONVERSIONS
What are conversions ?
Conversions:
A change in the form of a measurement, different
units, without a change in the size or amount.

6.  Count : The thickness and thinness of yarn is
called count .
 Length: Distance. How far from end to end.
example: the length of this guitar is about 1
meter

7.  Weight: "Heaviness". The downward force
caused by gravity on an object.

8. • Problem # 1 (English cotton count sys)
• If 240 yards of cotton yarn weigh 40 grains ,what is
the count of the yarn?
• C = (length in length units) / (wt in wt unit)
• C = (240 yards / 1 hank =840 yards) / (40 grains / 1 lbs =7000grains)
• C = [240 / 840] / [40 /7000] = 50s

9. • Problem # 2
• Find the count of 960 m of cotton yarn which weigh
20 gm.(Use French Cotton system)
• Since French Cotton system is also indirect sys so
formula will be
• C= Length in length unit/Wt in wt
unit=(960m/1km)/(20
gm/0.5kg)=(960/1000)/(20/500)=23.75=24’s

10.  Problem # 3 (1lb ,cut of 300 yds)
 What is the wt of 18 yds of woolen yarn whose
count 21’s(American cut)
 Wt=(18/300)/(21/1)=(18/300).(1/21)=(0.0028571429)lbs(7000
)=20 grains