Thomas Casson, of Denbigh, Wales, introduced an artistic, though somewhat cumbersome, arrangement. He duplicated the draw-knobs controlling the Pedal stops and couplers and located one set of these with the Great organ stops, another set with the Swell organ stops and a third with the Choir. He placed in the key slip below each manual what he called a "Pedal Help." When playing on the Great organ, he would, by touching the "Pedal Help," switch into action the group of Pedal stops and coupler knobs located in the Great department, switching out of action all the other groups of Pedal stops and couplers. Upon touching the "Pedal Help" under the Swell organ keys, the Great organ group of Pedal stops and couplers would be rendered inoperative and the Swell group would be brought into action. By this means it was easy to prepare in advance groups of Pedal stops and couplers suited to the combination of stops sounding upon each manual and by touching a Pedal Help, to call the right group of Pedal stops into action at any moment. The combination pedals affecting the Great stop-knobs moved also the Pedal stop-knobs belonging to the proper group. The Swell and Choir groups were similarly treated. But the simplest and best means of helping the organist to control his Pedal department is the automatic "Suitable Bass" arrangement patented by Hope-Jones in 1891 and subsequently. According to his plan a "Suitable Bass" tablet is provided just above the rear end of the black keys on each manual. Each of these tablets has a double touch. On pressing it with ordinary force it moves the Pedal stop keys and couplers, so as to provide an appropriate bass to the combination of stops in use on that manual at the moment. On pressing it with much greater force it becomes locked down and remains in that position until released by the depression of the suitable bass tablet belonging to another manual, or by touching any of the Pedal stop-knobs or stop-keys. When the suitable bass tablet belonging to any manual is thus locked down, the stops and couplers of the Pedal department will automatically move so as to provide at all times a bass that is suitable to the combination of stops and couplers in use upon that particular manual. On touching the suitable bass tablet belonging to any other manual with extra pressure, the tablet formerly touched will be released and the latter will become locked down. The Pedal stops and couplers will now group themselves so as to provide a suitable bass to the stops in use on the latter-named manual, and will continue so to do until this suitable bass tablet is in turn released. This automatic suitable bass device does not interfere with the normal use of the stop-keys of the pedal department by hand. Directly any one of these be touched, the suitable bass mechanism is automatically thrown out of action.