This is the beginning of "Study No.2" by Kreutzer, played with a long détaché stroke in the middle of the bow.
Repeating the same passage or study with détaché in different parts of the bow can be useful.
Observe the differences:
In the weight of the bow.
In how it feels to have the bow hand close or far away from the body.
SEE
Resources - Repertoire
...
