Sample Study Letter

The study letter is a letter or writing, whose purpose is to explain the essential points of a deep study to a Any subject, that is, a scientific study, or a technical study, does not have an exact page limit and can include graphics.
It is not addressed to a specific person and at the beginning it has the names of the authors or the person conducting the study.
Study letter example:

Psychology and Man.
By: Prof. yotor911.

Mexico DF. As of July 27, 2011.

Psychology is actually very old, it is guided by human behavior and began as the collection of information made by man, in order to understand his own nature. Later in the 19th century, the scientific principle was established, separating it from traditional philosophy.
It is very probable that psychology began its existence with the natural change from homo erectus, to homo sapiens, since with This change presented the conclusions and social principles that today emphasize what we know as society.
Apparently in ancient times it was reserved for priests, who emphasized divinatory predictions, and They try to explain the physical phenomena that existed, and that somehow influenced the way of life of the tribes or clans.

The divinatory sciences, influenced agriculture, livestock and even wars, and it is at this point, that the man had the need to know the psyche or way of acting of the masses to prepare them for war, or the hunting.
The mind of man, for perhaps evolutionary reasons, has a predisposition to the mystical and unknown, it was also seen in the need to know the temperament of members of the tribe or enemies, thus achieving social evolution, something that without psychology, which I would classify as empirical, could not be achieve.
The reflection of him in the water, the thunder and much more received false answers at that time, which were corrected with the passage of time, explaining in a clear and concise way that and how things worked and happened, even making use of all the phenomena at their fingertips.
Myths, stories and with writing the legends arose that were volatilizing the imagination, as well as were promoting education of the youngest members, who with the empirical transmission of information, achieved more accelerated steps in mythical and technical terms.
In my opinion, (but it is a completely personal aspect), it is empirical knowledge that caused the social evolution of humanity, and It is reflected in the eras, such as the Palaeolithic and the Neolithic, because as is evident, the technique evolves together with man.
They formed the explanation of life, with mythical and fantastic principles, forcing the imagination, and accustoming the mind to create new artifacts.
I handle fire, and this by its nature, was forcing to treat it with respect because of its dangerousness and at the same time man's need for its handling.
Psychology governs man, even before being considered as such, and are ancient cultures, Babylonians, Egyptians, Greeks etc. Who are the architects of what we know today.
Letter presented in the weekly newspaper of the National College of Psychology. Dr. Samuel Fronceca Robles.
Here he left another example of a study letter:

THE RESISTANCE OF THE MATERIAL, FOR THE MANUFACTURE OF FOOTWEAR AND LEATHER CLOTHING.

Study carried out by the Engineers. Everardo Domínguez Arriola and Eduardo Rodrigues Chabarria. Graduates of the national technical school.

Zapopan Jal. As of July 22, 2011.

To carry out this study, the products of three tanners were used, CLEMENTE BROTHER`S S.A, PELETERÍAS ALONSO S.A., and CURTIDORA MARTÍNEZ S.A.
From each of the interested parties, pieces of lamb and goat leather were obtained.
Of the goat pieces, as many of us know, the loin piece is the strongest and strongest for making shoes. In this type of leather, it is noted that Clemente brother`s S.A., had much better texture and was more uniform cut.
Speaking of cow leather, that of Casa Clemente brother`s, surpasses Alonso S.A. in quality, being the most suitable for the manufacture of long cane boots.
In these skins, a good handling can be perceived from the salting area and regarding its preliminary arrangement, an adequate humidity can be noted for its tanning, hair removal, is sufficiently clean both in ecological terms and in the finish of the leather, the handling of trypsin for cleaning the pores of the skin, it has been adequate, without excesses that would raise costs and without defects that alter the quality of the product.
The proper use of chromium in the tanning of this company is the most optimal as ecological. The PH residue was the lowest.
Finally, observing the company Curtidora Martínez S.A., it is evident that it is the one with the highest production, but it entails many deficiencies in tanning, since it wastes a lot of chromium, and they have not fully entered into the recycling campaign of chrome. Having to raise the price of the leather to compensate for the excess chromium used in its tanning.
The company "Peleterías Alonso S.A.", on the other hand, stands out in the hides and hides recovered for belts and soles, emphasizing widely on the soles, which in quality are enough to be considered the first in this category.

(Letter presented in, the weekly
"Peleteros de México", publication
free and informative dissemination,
sponsored by the state government.)