In an air stream these sparks, thanks to the small weight, will receive speed and a direction of those streams of a stream in which they take a great interest, and give rather bright trace of streams on a photographic plate. But by means of this method it is possible to define easily not only changes of directions of streams, but also their speeds. For this purpose before a device objective the disk rotating in regular intervals sotverstiem, and a spark trace on a plate t is put. The island turns out faltering. On number of breaks on unit of length of a trajectory it is possible to define easily speed of a spark, and consequently, and speed of the stream which are carrying away a spark.
At research of jet spectra rather interesting phenomenon, instability of a spectrum has been found. If the body has the smooth jet form the stream aspires to flow round pokonturu bodies that more than more speed of a stream. but to such sticking of a stream to a contour stir whirls arising at small speeds along a contour. If with something to revolt a stream whirls disappear also a stream sticks to a contour and on the contrary. As its resistance the strange thing turns out extremely depends on smoothness of a flow of a contour also: sharp skachkivelichiny resistance of a contour that in one, in other party. such way had been found the profiles which resistance sharply falls at the considerable speeds of a stream reaching 20... 30 metres '.
In an air stream these sparks, thanks to the small weight, will receive speed and a direction of those streams of a stream in which they take a great interest, and give rather bright trace of streams on a photographic plate. But by means of this method it is possible to define easily not only changes of directions of streams, but also their speeds. For this purpose before a device objective the disk rotating in regular intervals sotverstiem, and a spark trace on a plate t is put. The island turns out faltering. On number of breaks on unit of length of a trajectory it is possible to define easily speed of a spark, and consequently, and speed of the stream which are carrying away a spark. 
At research of jet spectra rather interesting phenomenon, instability of a spectrum has been found. If the body has the smooth jet form the stream aspires to flow round pokonturu bodies that more than more speed of a stream. but to such sticking of a stream to a contour stir whirls arising at small speeds along a contour. If with something to revolt a stream whirls disappear also a stream sticks to a contour and on the contrary. As its resistance the strange thing turns out extremely depends on smoothness of a flow of a contour also: sharp skachkivelichiny resistance of a contour that in one, in other party. such way had been found the profiles which resistance sharply falls at the considerable speeds of a stream reaching 20... 30 metres '. 
