Throw off the belt, turn down the spooler, and place the bobbin on the spindle. See that it runs true.
Hold the end of the thread with the right hand, and with the left wind the thread several times around the bobbin, or until the end is secured, and then break off the end to prevent its being caught up and sewed into the seam before the bobbin is empty.
Then wind the bobbin by operating the treadle, holding the thread firmly between the thumb and finger, and allowing it to pass from one side of the bobbin to the other, that it may be wound tight and even.