of the assumption of twist now it has been found that a very slight additional coherence was sufficient to assure the winding of the thread as a function of the initial coherence of the fibers a simple cohesive sizing may be sufficient this cohesive product may be added to the fibers either at the time of the preparation of the rovings or at the location of the spinning machine between the strand twisting member and the winding member in cases in which this is not sufficient or in cases in which sizing is not to be effected it has been found that the addition of a few turns of twist by means of a false twisting device made before the final twisting was sufficient to assure a good winding false twisting devices are known they may be rotary or operate by friction they may be static and a single winding on a rod may assure a twisting by rolling upstream of the rod when pulling on the thread provided that the angle of the thread with respect to the rod the diameter of the rod as a function of the diameter of the thread as well as the pitch of the thread on the rod and the coefficient of friction of the material of the rod are properly selected the example of fig3 is a device which satisfies these requirements it consists of a body 14 of light material which supports a rod 15 having the form of a semicircle arranged on the upper part of the body 14 the use of the device of fig3 will however be better understood from fig4 which shows a cross section through a double twist doubling spindle in which the bobbin of thread 16 is placed on the pot.