Engineering Drawing part-3


CH-1  Drawing instruments and their uses

3-Large size divider

The divider has two legs hinged at the upper end and is provided with steel needle at both lower ends.
It does not have any knee joints in there arms.
 















Use  of large size divider

1-It is used to provide curved or straight lines in two desired number of equal parts.
2-It is used to transfer the dimensions from one part of the drawing to another part 
of the drawing.
3-It is used to set the distance from the scale to drawing.

This device is very important for drawing because it provide exact dimensions  and measurements. 






4-Small bow divider-

The small bow divider is adjusted by nut at the top of the instrument ,it is very convenient for marking
minute divisions and large number of short equal distance.

















5- Lengthening bar 

Lengthening bar is used for circle of more than 150 mm radius 
It is used  when the lower part of pencil leg is detached and the
lengthening bar inserted inits place.

By this bar the length of the compass can be increased which
made big radius .






6-Small bow  ink pen-

It is also an important tool for drawing ,it is used for drawing small circles and arc in link


7-Inking -Pen

Inking-Pen is used for drawing straight lines and non circular arcs in link . 
It consists of a pair of steel nibs fitted to a holder made of metal.
Ink is fitted between two nibs to about 6 mm length.


 




for more important notes of civil engineering  click the link

For Engineering Drawing part-4



For Engineering Drawing part-2


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