 Complete the following phrase:  In 1851 Gilbert patented actions for horizontal and vertical pianos where escapement was operated by a lower extension of the hammer butt instead of by a fixed button in order to reduce the number of parts to allow a lighter touch, and with an additional projection to limit the motion of the jack to improve repetition. They granted their New York and general agencies to Horace Waters the same year, and Waters advertised their iron frame squares with the circular scale as well as upright grands and boudoir pianos. Gilbert  Co. received honorable mention for a square piano with the Aeolian attachment at the 