Focusing the Microscope
Every time you use a microscope you must adjust the focus for your eyes. A lot of people protest about eye strain using microscopes, although complaints are usually due to incorrect adjustment. The only exceptions are people with eyes that have non parallel lines of sight. If you include this condition, or if […]

Looking for grains that yield centered optic figures
Grains that yield centered optic figures are Isotropic as well as opaque minerals that have no optic figures. Then, for optic axis figures on uniaxial and biaxial minerals like find grains with minimum, if possible zero, and birefringence. Then, for flash figures, uniaxial and biaxial minerals are like […]

Microscopic characteristics
When dealing with new types or with rocks so fine grained that their component minerals cannot be determined with the aid of a hand lens, a petrographic microscope is used.

Separation of components
The division of the ingredients of a crushed rock powder from one […]

A petrographic microscope is used to view a series of characteristics in a mineral which imitate its properties and let us to recognize it.
The petrographic microscope is a compound microscope which is able to work with plane polarised light, meaning that it has some peculiarities.
This is constantly done with transmitted plane polarised light, meaning that […]

Use and History
The polarizing microscope is a greatly an optical measuring instrument as it is an instrument for the thorough examination of specimens. In addition to standard microscope optics, there is a polarizer in the condenser and one more mounted in a slider in the tube above the objective, either in rotatable, graduated, mounts. The […]

Documentation of the progressive evolution in microscope design for the additional prominent makers of petrographic microscopes and accessories can be found in their trade catalogs, where distinctive features can be noted for each manufacturer. Other publications record the instruments in a variety of scientific and museum collections, providing valuable details of design and construction for […]