The Modern Organ (Classic Reprint)

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Excerpt from The Modern Organ When Key 6 is depressed it raises a stem supporting Valves 10, said valves serving, first, to admit air pressure to Pneumatic Motor 9 from Pressure box I r and second, to allow it to escape to the atmosphere when the key is released. The pressure serves to expand Motor 9 which then moves the chain of action leading to the valve, formerly operated by the finger. When the key is released, the Valve 10 within Pressure box I I closes communication with the wind pressure and opens it to the atmosphere, allowing Motor 9 to de¿ate, permitting Valve 3 to close. It will be seen that the labor of the finger is now limited to the amount of pressure necessary to operate Valve IO and that the much greater labor of operating Valve 3 is now performed by the Pneumatic Lever 9. It is also obvious that the size of Valve 3 is no longer limited, as the Motor 9 may be made sufficiently large to perform any labor required of it. The introduction of the pneumatic lever was a tremendous advance over the original mechanical action, but the chain of action from key to valve, while greatly increased in efficiency, was still cumbersome and slow in action, as viewed from present-day standards. There appears to be some doubt as to who was the originator of the tubular-pneumatic action. Its general principle may be observed by a study of Figure 3. Pneumatic Motor 9 has been removed from its proximity to the Key, as in Figure 2, and placed directly beneath Valve 3. The mechanical connection between Key and Valve is now practically eliminated, a column of air contained in Tube 12 now serving as a means of communication between them. A primary valve-box, with valves identical in structure to the one shown in Figure 2, but of lesser dimensions, is now located above the keys, as shown in Figure 3. When Key 6 is depressed, air from Chamber 13 is admitted to Tube 12, through which a pneumatic impulse is imparted to Motor 14, there by raising Valves 10, which were formerly raised by the Key, as in Figure 2, resulting in an Operation of Motor 9, identical with that previously described with reference to Figure 2. The great weight of mechanism and consequent sluggishness incident to a mechanical construction has now given place to a column of air, resulting in an increase in the capacity for speedy Operation. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.