MEASURING TO SCALE

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MEASURING TO SCALE
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How do we define scale?

• A scale is a proportion or ratio
• This proportion or ratio allows us to draw
  objects either by reducing or enlarging them
  proportionally.
• This allows us to show the relationship of all
  the parts of an object or drawing.
• Without scales we would not be able to draw
  objects larger than a sheet of paper accurately.

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Different types of scales

• 1. Architects Scale
• Are used for structures and buildings. They are
  used to measure interior and exterior dimensions
  such as rooms, walls, doors and windows.
• Usually have the following dimensional
  relationships.

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Different types of scales

• 2. Engineers Scale
• Are used for measuring roads, water mains, and
  other similar topographical features.
• Usually have the following dimensional
  relationships

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How is a scale read?
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How is a scale read?

• 1. Line up the zero mark on the scale selected
  with the beginning of the item you wish to
  measure.

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How is a scale read?

• 2. determine at what point on the scale the end
  of the item you wish to measure is.

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How is a scale read?

• 3. Read the number off the scale that is closest
  to the ending point of the item measured.
• ? Mentally note this number and be sure to
  'round down' even if you are close to the next
  number.
• ? This number represents the whole feet of
  the item you are measuring.

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How is a scale read?

• 4. Then slide the ruler so that the number you
  noted mentally lines up with the end of the item
  being measured.

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How is a scale read?

• 5. Go back to the zero end of the scale. The
  fractional feet to be measured will be
  represented by the distance of the start point of
  the object being measured to the zero point on
  the scale.
• Take the reading from this part of the scale
  (depending on the scale this may be graduated
  smaller or larger than 1") and add this number
  to the whole feet you mentally noted earlier.

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SCALE INCREMENTS
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SCALE INCREMENTS
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SCALE INCREMENTS
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SCALE INCREMENTS
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SCALE INCREMENTS
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How is a scale read?

• The following video clip is a brief explanation
  on how to use an Architects scale.
• http//academics.triton.edu/faculty/jhalpin/ARC109
  /lectue_week_two.html
• Source Professor JoBeth Halpin, Triton College,
  River Grove, Illinois

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