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## The welding gauge has three scales with a nonius.The use of the Vernier allows an increment of accuracy of the readings on the scales K, H and W as illustrated by the Figure 6 below . The principle of the vernus is based on the following. The accuracy of visual interpolation of the position of the pointer between the divisions of the scale is low and by approximation it is about 1/3 of each division. However, the eye can record it with high accuracy from the exact point of coincidence of two the images. An error in recording such a coincidences is a fraction of the thickness of the grinding marks, which, is significantly less than the aforementioned 1/3 of the distance between the grinding marks. The nonius also allows you to obtain the information about the position of the pointer between the divisions of the scales at the exact point of coincidence of two marks.Nonius is a moving scale www.tapirus.info 10 из 59 associated with a pointer that slides along the main scale. The pointer simultaneously works as the zero position of the vernier scale. The divisions on the vernier scale are plotted as follows. Vernier Accuracy Selected: δ = D/N, where : D – division scale of the main scale (for scales K, H и W = 1mm) N – natural number (10 for scale K, H and 20 for sale W).  If we combine the zero vernier with one of the divisions of the main scale, then the first grinding mark of the vernier is applied so that it lags the next mark of the scale by δ, the second by 2δ, the nth by nδ. The last Nth grinding mark of the vernus again coincides with one of the figures on the main scale. ## Scale Pitch D = 1 mm; δ = 0,1 мм. Range of measurements [0…23] mm. ## Scale Pitch D = 1 mm; δ = 0,05 mm.Range of measurements [0…55] mm. ## Scale Pitch D = 1mm; δ = 0,1 mm. Range of measurement scales not more than [-6…20] mm. The measurement range when the taper gauge 5 is moved down is conditionally selected positive from the interval of [0 ... 20] mm. The number of integers in mm is counted from the zero mark of the main scale upwards, and the number of tenths from the zero mark of the nonius is taken upwards. The measuring range when the taper gauge 5 is shifted up, respectively, is conditionally selected negative form the interval of [-6 ... 0] mm. The number of integers in mm is counted downwards from the zero mark of the main scale, and the number of tenths, respectively, from the mark of the nonius 1 is counted downwards . 