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 &amp; Co. received honorable mention for a square piano with the Aeolian attachment at the 1851 London Exhibition, a silver medal for the second best piano at the 1851 American Institute fair, a diploma for an aelioan attachment at the 1852 American Institute fair and a bronze medal for the third best square at the 1853 Exhibition of the Massachusetts Charitable Mechanic Association.