The limit test applies except when human exposure indicates the need for a higher dose level to be used.

Observation angle (symbol α) means the angle between the illumination axis and the observation axis.

A location of an observation platform is received from the observation platform, the location of the observation platform being determined by a global positioning system on the observation platform.

A monitoring method makes use of a furnace monitoring system.

The invention also relates to an associated observation method.

An observation condition memory (20) stores the optimal observation conditions for each detector.

Observation on half-plane means the half-plane which originates on the illumination axis and which contains the observation axis

Thus, a clear observational image can be obtained by preventing the deposits from adhering to an observation window of an observation device without cutting off the view.

The invention also relates to an illumination device, an optical observation device and an optical observation appliance.

The equipment assembly contains at least one survey sensor to enable the survey sensors along a length of the marine survey carrier structure to be regularly spaced.

Distances between the observation samples anό the circular perimeter of each observation constellation are determined.

Electrodes in the observing electrode array are selected to serve as a power supply electrode and an observing electrode respectively.

fishing with assistance of spotter planes

The optical viewing instrument may have an observation tube and an ocular attached thereto.

A sample observation device is provided with an illuminating optical system and an observation optical system.