What is the name of this instrument?

(a)  

An instrument used for mark angle.What is it?

(a)  

Identify the name of this instrument

(a)  

A device used for non standard arc

(a)  

A device used to draw circles without using a compass

(a)  

What is the name of this instrument?

(a)  

Name the device used for drawing 30 45 and 60 degree angular lines

(a)  

This is used to protect the required drawing lines while erasing

(a)  

What is the name of it?

(a)  

What these numbers indicate?

(a)