This book is the first to describe in an exact, rigorous and scientific way the theory of the kite. It should therefore be a well known reference book. Even if cited sometimes, it is actually deeply unknown, as is the first name of its author whose only initial is mentioned.

 
Anyone interested in kite theory cannot miss this book.
You will discover a great work.

 
Reading Guide by C. Becot,

 

author: Emile BERTINET, published in 1887.

 

Émile Bertinet was an associate professor of physics. He taught for 3 years in Reims, when he experimented with kite flying and established the theory. He presented it to the National Academy of Reims which will make the publication, both in their annals and drawn separately as a book.

 

At first glance, this book is boring and abstruse. No table of contents ; only the sub-paragraphs are numbered; whole pages are undergraduate mathematical developments. Hypotheses and definitions are buried in the text. It is therefore an arduous read for the uninformed reader.
Not surprisingly, no references citing this book describe its content and interest.

 

In fact the content of this book is remarkable. The hypotheses, the principles, the demonstrations are rigorous and easy to understand. There are several very sensible concepts. The conclusions are fair and accurate. Bertinet lacked the physical data to support and adjust the physical coefficients predicted by the theory. The instrument he certainly lacked was an anemometer.
The content, the scientific and practical value of this book for understanding the mechanism of the aerodynamic balance of the kite are unsurpassed.

 
To alleviate the reading difficulty and allow any curious person to easily explore its contents with only some basic knowledge of mathematics and physics, I established a reading guide.
I therefore invite you to read it and immerse yourself in the parts of Bertinet's book that are indicated.

 

It served as a basis for the scientists of the time. The principles and formulas will be taken up by Lieutenant Blois who in 1906 will devote half of his book Les cerfs-volants et leurs applications militaires to the theory of the kite.
Knowing this work of Bertinet would have allowed to several modern authors not to promulgate erroneous explanations and to pseudo theories not to exist.