Abstract: An apparatus for adapting an electric player piano to play the hours, simulating the chimes of a clock, can be attached to the piano without alterations to the piano of a permanent nature. The apparatus includes a clock for actuating the piano on each hour and a switch responsive to actuation of a predetermined note by the piano for producing a control signal for turning the piano off. A second switch, responding to actuation of a second predetermined note, produces a signal for suppressing striking of the hour during the night. A sensor block carrying one or more switches may be placed upon the keyboard for detecting depression of corresponding keys. In addition, a key may be maintained in a partially depressed condition to prevent its sounding when it is used to produce a chime control signal.

Abstract: An apparatus and process for dehydrating waste solids concentrates including secondary and digested sewage sludges and those concentrates prone to form emulsions upon the addition of oil are obtained and accomplished by mixing the sludge or other concentrate with fluidizing oil prior to dehydration by heat evaporation to maintain pumpability; recycling a portion of the substantially anhydrous waste solids and oil evaporator output slurry, and admixing it with the fluidizing oil and input sludge or concentrate to regulate the solids content and viscosity of the steady state feed mixture and thereby prevent fouling of the evaporator heat transfer surfaces and convert emulsions to suspensions.

Abstract: An apparatus and process for dehydrating waste solids concentrates including secondary and digested sewage sludges and those concentrates prone to form emulsions upon the addition of oil are obtained and accomplished by mixing the sludge or other concentrate with fluidizing oil prior to dehydration by heat evaporation to maintain pumpability; recycling a portion of the substantially anhydrous waste solids and oil evaporator output slurry, and admixing it with the fluidizing oil and input sludge or concentrate to regulate the solids content and viscosity of the steady state feed mixture and thereby prevent fouling of the evaporator heat transfer surfaces and convert emulsions to suspensions.