The pneumatic player, the regulation and repair of some modern types . d depress all thecontrol levers. Unscrew the secondary tube blocks(6 and 7, Fig. II.) and the soft pedal block beneaththe key bed; disconnect the motor and primarychest tubes (not the tracker tubes), one at each endof the upper action ; disconnect the tempo and re-roll rods and unscrew the panel at the back of thespool box from the iron frame. The keyboard,primary chest and motor will now draw forwardtogether. See that the themodist box is clearthough, and take care that all the screws in thetube blocks are withdrawn. The p
The pneumatic player, the regulation and repair of some modern types . d depress all thecontrol levers. Unscrew the secondary tube blocks(6 and 7, Fig. II.) and the soft pedal block beneaththe key bed; disconnect the motor and primarychest tubes (not the tracker tubes), one at each endof the upper action ; disconnect the tempo and re-roll rods and unscrew the panel at the back of thespool box from the iron frame. The keyboard,primary chest and motor will now draw forwardtogether. See that the themodist box is clearthough, and take care that all the screws in thetube blocks are withdrawn. The primary chestcan, if required, now be stripped, and the bleedholes and tubes cleaned. For the benefit of theuninitiated, I should explain that primary valvesadmit air to their work and secondary valves shutoff the same. To remove a key, unscrew two nuts from thetracker box metal work. Disconnect from thehammer rail; the same with tubes, motor andthemodist puppet box, lifting off the primary chestbodily. To remove the secondary valve chests, it 24 THE PNEUMATIC PLAYER. Fig. II. Lower Action of Pianola Grand. 1. Reservoir. 2. Low tension governor. 3. Automatic pedalsustainer. 4. Motor governor. 5. Secondary valve chest andlevers. 6. Treble tube block. 7. Bass tube block. 8 Re-roll Low tension tubes. 10. Themodist tubes. 11. Tempo Main exhaust tubes. is advisable to have the grand placed on its legs, unscrew tube blocks (if upper actionis not already withdrawn); take out screws fromtreble and bass ends of valve chests (eight screws);disconnect large exhaust tubes at treble and bass ;unscrew iron bar (to which pedal box has beenattached, the pedals, of course, having already THE PIANOLA 25 been removed); take off tempo rod and lift chestsforward, exercising great care not to rest them onthe metal exhaust tubes at their ends. When thesemetal tubes are unscrewed, it is an easy matter tostrip the valve chests and gain access to thepouches and valves. The a
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