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JSS1: BASIC TECHNOLOGY - 2ND TERM

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  1. Building Materials | Week 1
    5 Topics
    |
    1 Quiz
  2. Uses of Building Materials (Concrete) | Week 2
    5 Topics
    |
    1 Quiz
  3. Drawing Instruments & Materials (I) | Week 3
    4 Topics
    |
    1 Quiz
  4. Drawing Instruments & Materials (II) | Week 4
    2 Topics
    |
    1 Quiz
  5. Drawing Instruments & Materials (III) | Week 5
    2 Topics
    |
    1 Quiz
  6. Board Practise (I) & (II) | Week 6 & 7
    4 Topics
    |
    1 Quiz
  7. Title Block | Week 8
    2 Topics
    |
    1 Quiz
  8. Free - Hand Sketch | Week 9
    2 Topics
    |
    1 Quiz



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1. Drawing Board:

This is a flat wooden board with a smooth, rigid surface. It is of different sizes depending on where it is used as shown in the table below.

S/nTypeDimensionWhere Used
1.Half
imperial
585 × 452 mm This is commonly used
by students.
2.Full
imperial
812 × 452 mm This size of a drawing board
is used in offices.
drawing board 500x500 1 e1670561324583
Drawing Board.

2. Tee-square:

This is a T-shape instrument containing a head and a stock. It is used for drawing horizontal lines, for setting the paper on the board and also to support the set square during drawing. It is placed on the drawing board with a stock at the left-hand edge of the board. It can be made of wood or plastic.

tee square
tee square
td2
Drawing horizontal lines with Tee square.

3. Set-square:

These are instruments in the form of a right-angled triangle, made of plastic. We have the 45° and 30°/60° set squares. They are used for drawing vertical and angled (slanted) lines. They can be made of plastic or wood.

set square
Set-square.
td4
Drawing vertical lines with a set square.

4. Scale Rule:

This is a 30cm wooden or plastic ruler, used for measuring lengths and dimensions of scale drawings. It is a three-sided ruler used by architects to convert dimensions into a smaller drawing of a building plan and readers of blueprints to translate the drawing into the real sizes for construction.

Triangular-Scale-Ruler
Scale Rule.

5. Protractor:

The protractor is a plastic semi-circular instrument, used for measuring angles in degrees.

protractor
Protractor.

6. French curves and Flexible curves:

This instrument is used to draw different types, sizes, and shapes of curves. It enables one to draw curves that would be difficult to achieve with a compass. The flexible curves are used for the same purpose.

french curve
French curve.
flexible curve
Flexible curve.

7. Drawing set:

This is a pack containing different drawing items like a pair of compasses and dividers.

Professional-Drawing-set
Professional-Drawing-set.

8. Compass:

A compass is used for drawing circles and arcs. There is the small bow compass and the large–size compass.

potracto
Compass.

 9. Divider:

It resembles a compass but has two pin edges. It is used for copying lengths, i.e. transferring measurements from the metric rule to the drawing. It is also used for scribing circles or semi-circles on metal surfaces.

divider
Divider.

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