Бурение грунтовых зондов, установка энергетических колодцев

There are two particular sources of error to be recognised when using photographic instruments:

• Instrument error — due to the inaccuracy of the device itself, infrequent calibration and damage caused to the instrument.

• Reader error — the developed film is easily mis-read. Some discs may have to be magnified to be read properly. Readings should be verified by another person (although this is seldom the case on the rig). Under ideal conditions (i. e. selecting correct angle unit, non-magnetic collars, centralization of tool etc.) inclination is accurate to +/-0.25 degrees, and direction to +/-2 degrees.

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