Electric Reproducing Pianos (The Duo-Art)
By Wilberton Gould, Member N. A. of P. T., New York City
Service, as defined by Webster: "An act of one who serves."
It is one of God's greatest gifts to mankind, for who is happy who does not serve? Hence it follows that service requires sacrifice. It is the foundation stone of every enterprise. Whatever it may be, its success or failure depends upon whole-hearted co-operation.
And may service and sacrifice continue to be the keynote of our progressive Association.—The Author.
The Duo-Art Upright Governor
In the grand Duo-Art the governor is Practically the except that the action cut-out is in the modulator box underneath the bed next to the rotary pump, and its function will be discussed under the heading "Duo-Art Grand Modulator Pneumatic."
Sustaining and Hammer Rail Lift
Quietness of operation is highly desirable, and it is obtained through the medium of the multiple valve control in conjunction with the pressure regulator. A knife valve and a regulator spring are attached to the pressure regulator pneumatic. Adjustment of this spring will control the action of the sustaining pedal, the accordion pneumatics and the hammer rail lift as regards snappy action and quietness. The sustaining pedal and the hammer rail are also controlled through the stop buttons, figures 2 and 3. Too great a tension on the regulator spring No. 1 will cause noise and valve clatter, and too little tension will produce sluggishness of the action. In this unique control it will also be noted that there is regulated and unregulated atmosphere.
In the upright Duo-Art, in conjunction with the soft pedal or hammer rail lift is a pallet valve (not illustrated) whose function is to collapse No. 2 accompaniment accordion pneumatic on the expression box to compensate for the lost motion created by the hammer rail lift. In the grand model the sustaining and hammer rail lift pneumatics are controlled from the modulator pneumatic, and perform the same duty as stated above.
In illustration "0", page 38, are shown the tubing layout, valve control and the position of the repeat slide valve block of the upright Duo-Art, located on the left side of the roll box. In this illustration the switch valve block is mounted on the righthand side of the case, and shows the pneumatic and the valve box as a unit. In the grand model, the switch unit and the switch pneumatic are separate units, but the principle remains the same, no matter how the units are assembled.
Grand Duo-Art Modulator Control Pneumatic
Attached to the grand governor tempo control box and to the grand modulator control box are two small pneumatics, one ( No. 14) on the modulator box and the other on the governor box. Pneumatic No. 14 on the modulator box collapses and opens port No. 3 on the modulator box, and is a pump relief on reroll when these two pneumatics are teed together.
The spring No. 20 on the modulator is set correctly at the factory, and set so that the degree of modulation is one-half the full volume of the Duo-Art. This will correctly control the action of the accordion pneumatics on the expression box and the action of the sustaining pedal. This spring should not be tampered with. Should it be necessary to get at valves Nos. 10 and 5 on the modulator box, this may be accomplished by removing the lower cap, where slide valve No. 4 is situated, but as these valves are of considerable size this occasion seldom arises.
Grand Crash Unit
When setting the crash valve all theme pneumatics should be collapsed, valve arm No. 6 (see illustration "R," page 45) should be up, and the adjusting screw in the arm should just raise pallet valve No. 5. Should it fail to do so, one or two turns of regulating screw No. 6 should be sufficient. Rough adjustments may be made with regulating screw No. 7 and fine adjustments with screw No. 6. Care should be exercised that the upward travel of arm No. 7 is not so great that it will act when power fourteen comes on ; in others words, the pallet valve should not rise more than one-sixteenth of an inch.
Key Frame Shift
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