| 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. |
| 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. |
| Rick set up his microscope on the kitchen table and plugged in the substage illumination. |
| Once she turned the substage mirror a bit to catch direct the light streaming in the window. |
| Rick spread a small amount on a slide, switched on the substage light, and put the slide on the stage. |
| Adjust the substage mirror so that the light is reflected upward. |
