AccuLine Pro 40-6910 Gebruiksaanwijzing - Pagina 6

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In the illustration to the right, the index

has passed the 44 degree line but has

not gone as far as the 45 degree line.

In this case, the third vernier line from

the index is lined up with one of the

lines on the circle. Since each vernier

line represents 15 minutes add 45 minutes to the 44 degree reading

(3 times 15 minutes equals 45 minutes). Therefore our exact reading

is 44 degrees, 45 minutes (44º45').

The Vertical Vernier.

In reading the vertical vernier, the principle is exactly the same as the

horizontal vernier. Note however, that the vernier is below the circle

portion rather than inside as in the case of the horizontal. One other

minor difference is that you will read angles up or down rather than

left or right. Here again is a double vernier. The right hand side

reads angles of elevation (up) and the left hand side reads angles of

declination (down). These are the only differences between the

horizontal and vertical verniers.

5. Calibration

5.1 Bubble adjustment

If the telescope bubble does not

remain centered after having

leveled the instrument, and

reversed the telescope end for

end (180º) (as described under the Leveling section) the need for

adjustment is indicated. Use a 3mm hex key.