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# Virtual Goniometer in Five Minutes Degree Resolution (5′)

`How to use the goniometer dopted of vernier to reading in degree (°) and minute (')`

In this simulator, the diameter of the so-called ‘graduated disk’ is divided into 360 equidistant spaces, called ‘degrees’, which are the 360 circular sectors of 1 ° (one degree) each.

By rotating the disc you will see the angle formed with a fixed line. At the top of the disk there is the vernier or nonius. The ‘zero’ mark (0) of the mark marks the whole degrees of the angle. Nonius has twelve divisions referring to the sixty minutes (division of the degree) which means that each stroke ‘marks’ 5′ (five minutes). The interpretation of teh vernier can be comprehended in the page: ‘vernier: simulator of reading and interpretation: vernier scale in millimeter, tenth resolution – Metrology’.

Note that the interpretation of this nonius is counterintuitive. We are accustomed to the so-called ‘direct vernier‘ (in them the N graduations of the NON correspond to N-1 graduations of the main scale). The vernier of this simulator is the so-called ‘retrograde vernier’ (see that the N graduations of the vernier correspond to N + 1 graduations of the main scale). In this way, we must ‘read’ the marking following the same direction of rotation of the disc.

The mechanics of using the goniometer simulator at the bottom of the page are: rotate (drag and drop) the disk and investigate the degrees and minutes reading. A small icon (left of the screen) will help you visualize the formation of the angle.

Because of the limitations of the monitor resolution, some of the marks can appear not aligned.

## Virtual goniometer in degree resolution five minutes (5′)

Beacuse of limitations of monitor resolution, some of the marks can appear not aligned.

##### Eduardo Stefanelli

Engenheiro por profissão, professor por vocação