AccuLine 40-6910 Manuel d'instruction - Page 5

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7/29/09

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Page 5

Keep about half the length engaged. When the bubble is centered in posi-

tion #1, turn the instrument and observe the vial in position #2. Now cen-

ter the bubble in position #2 using only screw C. The instrument should

now be leveled, but to be certain, double-check. Rotate the instrument

180º so the vial is reversed. If the bubble will not center when reversed,

follow adjustment procedure outlined under "Bubble Adjustments."

Aiming and Focusing

Rotate the instrument by hand to aim the telescope to the far object.

Rotate the focusing knob until the object can be observed clearly.

Rotate the horizontal tangent knob, to place the vertical cross hairs

on the object.

Reading the Vernier

The vernier is actually a double

vernier, that is, two verniers in

one. This makes it possible to

read any angle turned by the

telescope, whether to the right

or to the left. For example,

consider that you have turned

an angle to the left (counter-

clockwise) after first having set the circle to read 0º. Refer to the

bottom figure, this is what your vernier looks like after having turned

the angle.