Very few scullers realise the great importance of even action of wrists. If one scull hangs in the water a fraction of a second more than another, or buries deeper, or skims lighter, the two hands at that moment are not working evenly. Therefore the boat is not travelling in a straight line; therefore she will sooner or later, may be in the latter half of the very same stroke, have to be brought back to her course. In order to bring her back, the hand which, earlier, was doing the greater work, must now do less. Therefore the boat has not only performed a zigzag during the stroke, but also she has been, while so meandering, propelled by less than her full available forces, first one hand falling off through clumsiness, and afterwards the other hand shutting off some work, in order to equalise matters. As the sculler becomes more used to his action, he will find his boat keep more even. At first he will be repeatedly putting more force on one hand than on another, and will have to rectify his course by counterwork with the neglected hand. Some scullers, though otherwise good, never steer well. They do not watch their stern-post, to see if they go evenly at each stroke; still less, if they see a slight deflection to one hand after one stroke, do they at once rectify the deviation by extra pressure on the other hand during the ensuing stroke. A good steerer in sculling will correct his course even to half a stroke; if through a bend, or a wave, or other cause, he sees one hand has taken the other a little round by the time that the sculls are crossing, he will row the other hand home a trifle sharper, and so bring the keel straight by the time he feathers. When a sculler gets more settled to his work, and has got over the first difficulty of clearing his hands at the crossing, he will begin to acquire the knack of bringing the boat round to one hand, without any distinct extra tug of that scull. He will press a trifle more with the one foot, and will throw a little more of his weight on to the one scull, and so produce the desired effect on his boat.