A Scale Ruler converts the measurements on a drawing
to the actual size of the building
For a Scale of 1:20,
every 1mm on the ruler
is multiplied by 20
Example 1
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
25mm
So what is the actual length?
25mm x 20 = 500mm
Convert to metres
500 = 0.5m
1000
Example 2
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
26mm
So what is the actual length?
26mm x 50 = 1300mm
Convert to metres
1300 = 1.3m
1000
We have only moved 1mm on the ruler so
why is there such a difference in these lengths?
Example 3
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
13½mm
So what is the actual length?
13½mm x 200 = 2700mm
Convert to metres
2700 = 2.7m
1000
Why are there extra lines on the scale rule?
Example 4
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
75mm
So what is the actual length?
75mm x 1 = 75mm
1:1 is full scale
As a bricklayer, what is the importance of 75mm?
Example 5
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
45mm
So what is the actual length?
45mm x 5 = 225mm
As a bricklayer, what is the importance of 225mm?
Example 6
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
15mm
So what is the actual length?
15mm x 20 = 300mm
As a bricklayer, what is the importance of 300mm?
Example 7
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
90mm
So what is the actual length?
90mm x 10 = 900mm
What do you recognise about 900mm?
Example 8
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
36mm
So what is the actual length?
36mm x 50 = 1800mm
Convert to metres
1800 = 1.8m
1000
What do you know about 1.8mm?
Example 9
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
22½mm
So what is the actual length?
22½mm x 100 = 2250mm
Convert to metres
2250 = 2.25m
1000
What do you know about 2,250mm?
to the actual size of the building
For a Scale of 1:20,
every 1mm on the ruler
is multiplied by 20
Example 1
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
25mm
So what is the actual length?
25mm x 20 = 500mm
Convert to metres
500 = 0.5m
1000
Example 2
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
26mm
So what is the actual length?
26mm x 50 = 1300mm
Convert to metres
1300 = 1.3m
1000
We have only moved 1mm on the ruler so
why is there such a difference in these lengths?
Example 3
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
13½mm
So what is the actual length?
13½mm x 200 = 2700mm
Convert to metres
2700 = 2.7m
1000
Why are there extra lines on the scale rule?
Example 4
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
75mm
So what is the actual length?
75mm x 1 = 75mm
1:1 is full scale
As a bricklayer, what is the importance of 75mm?
Example 5
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
45mm
So what is the actual length?
45mm x 5 = 225mm
As a bricklayer, what is the importance of 225mm?
Example 6
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
15mm
So what is the actual length?
15mm x 20 = 300mm
As a bricklayer, what is the importance of 300mm?
Example 7
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
90mm
So what is the actual length?
90mm x 10 = 900mm
What do you recognise about 900mm?
Example 8
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
36mm
So what is the actual length?
36mm x 50 = 1800mm
Convert to metres
1800 = 1.8m
1000
What do you know about 1.8mm?
Example 9
Look at the image below
How many mm are shown between the arrows
Click image to enlarge
Answer
22½mm
So what is the actual length?
22½mm x 100 = 2250mm
Convert to metres
2250 = 2.25m
1000
What do you know about 2,250mm?
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