The first substage is preparation, which involves initial focusing and consists of two steps. |
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This is an evidence of a significant tectonic tilting that took place, at least partially, after substage 5a because phreatic speleothems of this substage are now located at different altitudes. |
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High grade optics give superbly clear views of difficult, dark and intricate surfaces, with lighting from 2 x 30W semi-coaxial mounted spotlamps and 30W vertically aligned substage illumination. |
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The substage condenser must have a continuously variable circular aperture diaphragm and be capable of true Kohler illumination for the full spectral range of 350 to 950 nm. |
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Starting from the latter study, the section has been included to the Johvi Substage of the Haljala Stage, or more precisely to the lower part of the Johvi Substage. |
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