Introduction
Students of pipe organ economics and history are continually fascinated by the wide variety of non-mechanical windchest actions developed by American organbuilders in the last century. These ingenious mechanisms speak to the resourcefulness of enterprising men eager to find an efficient and reliable system to differentiate their product and, thereby, to carve out a niche for themselves and their firm in the highly competitive marketplace for pipe organs. Windchest innovations formed the core of the nonmechanical systems. They would become a defining characteristic of American organbuilding in the first half of the twentieth century and mark its contribution to the evolution of the King of Instruments during this period. Marvels of mechanical ingenuity, they far surpassed developments on the Continent. As James B. Jamison commented: "In mechanisms they excel the Old World product so far as to make comparison unfair."1 Among the most important and far reaching innovations was the electropneumatic pitman action windchest which traces its origins to an obscure nineteenth-century Continental organbuilder, August Gern.
In writing a paper in which I remarked that Ernest M. Skinner had taken the pitman windchest to "Mount Olympus," I recalled a comment years ago by the late Dr. Homer Blanchard that August Gern was the inventor of the pitman action.2 Some years later I verified Blanchard's observation in Audsley's The Art of Organbuilding.3 I was curious about Gern and his system. At the suggestion of Barbara Owen, I phoned Professor Christopher Kent at the University of Reading in the United Kingdom who referred me to his student, Paul Joslin. Paul has researched and written on Gern's tenure in the British Isles. He kindly briefed me on Gern and sent me a copy of Gern's patent which would shed light on this question.4
Windchests
To begin, we need to review briefly the nature of a windchest and the nomenclature of the so-called "individual valve" actions. A windchest is a rectangular wooden box working in tandem with the console as a transfer mechanism, i.e., it transfers wind from the bellows to the pipes enabling them to speak. A stop action and a key action are its two essential components. Differences in the design and operation of these two actions distinguish one system from another and establish the two broad categories of nonmechanical windchest action: ventil and universal.
A ventil chest is distinguished by the fact that the individual stops are not winded unless the stop is on, i.e., pulling the stop knob opens a valve and charges the stop on the chest. Widely used in the early decades of this century, it was closely associated with the novel pull-wire ventil employed by Hillgreen-Lane, was incorporated in Kilgen organs until the firm's demise in 1958, was the mainstay of the Estey Company and was built by Tellers well into the post WWII era. Organ Supply Industries continued to list the ventil windchest in their catalog until 1982.5
A universal windchest is any system in which the wind is under all the stops at all times. The term "universal" is closely associated with the ingenious Austin patented system, in the beginning a large walk-in enclosure located directly under the pipe valve mechanism. Technically, however, a pitman action is also a universal windchest because the wind is always under all the stops. The salient feature of a pitman action is the key and stop action. As Randall Wagner, Organ Supply Industries executive, explains, a pitman action is fundamentally a fluidics mechanism, an x, y switch in which both x for stop and y for key must be "on" for the pipes to speak.6 These switches are, as Jan Rowland points out, relief valves which are activated by a motor, in modern practice a leather disc (formerly with a wooden stem) or flap, akin to a solenoid, whose movement seals or exhausts the key and stop channels.7 In the lexicon of today's computers these switches would be known as an AND gate.
By 1900 the race was on as the transition from tracker to non-mechanical action swept the American organ industry. Ten years later if you did not have a workable windchest you were either out of business (Gratian) or severely handicapped (Hinners). But if you had an efficient and competitive system, it just might be the cornerstone of a long and prosperous tenure in the industry (Austin, Wicks). The universal airchest of the Austin Company, with the familiar decal on the enclosure door, and "Built on the Bennett System" on the nameplate of the Bennett Organ Company instruments, demonstrated that firms were eager to capitalize on their innovations in the rapidly growing market for non-mechanical organs.
The pitman action gradually emerged as the odds-on favorite of American builders and organists, initially because of the overriding influence of Ernest M. Skinner, whose mechanism became the generic term for the system, but also because of its perceived advantages. By the post WWII era it had become dominant. The ventil, aside from the exceptions cited above, virtually disappeared. Skinner's contribution notwithstanding, innovations in windchest and console design and construction are, most likely, the work of individuals and firms over time in several stages of development. One is, therefore, understandably reluctant to attribute a major technological development in organbuilding to one individual. Nonetheless, if we can establish, from an analysis of his patent, that Gern's system functions like a pitman action then we are safe in saying that he is one of the pioneers of this redoubtable mechanism.
August Gern and His System
August Friedrich Herman Gern (1837-1907), a native of Berlin, Germany, was the son of a cabinet maker whose family had lived for several generations in or near Berlin and whose ancestry was traced as far back as 1415 when one Christian Gern was baptized in Zwichau. After acquiring woodworking skills, most likely from his father, Gern obtained organbuilding knowledge, probably from Carl Friedrich Buckholz, although he may have also worked with Sauer, Lang and Diese. In 1860 he migrated to France where he was employee and foreman of the celebrated Aristide Cavaillé-Coll (Buckholz was a pupil of Cavaillé Coll). In 1866, after installing one of the Parisian master's instruments in the Carmelite Church in Kensington in the United Kingdom, Gern opened his own shop in London. He operated from several locations in London and, from 1872 to 1906, at Boundary Road, Notting Hill (the shop building is extant).8
On November 6, 1883 Gern filed a patent application (see diagrams) for "Improvements In Organs And Similar Wind Instruments." He described his invention as a key and stop action channel "designed to simplify the construction and operation of parts . . . and to avoid the loss of wind and objectionable sounds that often result from leakage."9 His reference to loss of wind and objectionable sounds was, perhaps, referring to the Kegellade or cone valve chest, the system then widely used by Ladegast, Sauer and other German builders. Although the key and stop channels, acting as relief valves, were the focal point of his invention, there were other far-reaching implications of his system. One was provision of two sets of relief channels to permit duplexing. Another was the use of chest wind to open the valve. In this respect his mechanism was, theoretically, similar to "Roosevelt" type actions which utilized chest wind as the operating force. Interestingly, and as if to anticipate the future, Gern asserted that "collapsible or bellows-like cells" (i.e., pouches) could also be used.
The following step-by-step analysis of Gern's patent is made with some trepidation and a note of caution. It is very difficult to comprehend the working of up to six valve positions of the mechanism in a single set of diagrams each portraying only one position. Have you ever tried reading Audsley? The diagrams are reproduced courtesy of Robert Vaughan, chief engineer of the Reuter Organ Company, who copied them from Audsley. Ironically, Audsley had discovered an apparent error in the Gern patent diagram regarding the position of the pitman.
Following the diagrams: Figure 1 is the key action. When the center-pivot key A is depressed as the note is played, the lug a on the key tail opens the leather-covered pallet B, exhausting the key channel D. When the key is released, wind from channel E pushes down on pallets C and B, charging key channel D. A closer look suggests that pallets C and B work much like a primary action in a modern pitman windchest.
Figure 2 is the stop action. As shown, the stop is "on" with channel L exhausted through slide G. When the stop is "off" slide G is moved to the right, causing wind from H to recharge channel L.
Figure 3 is the heart of the mechanism. In the Gern system the pitman "motor" is a teeter-totter, hinged in the middle and pivoting up and down at each end, shown as m1, m2. When the key channel is exhausted from Figure 1, wind from the stop action channel L (the stop is "off") pushes m2 up and m1 down, sealing the exhausted key channel and maintaining wind pressure in cylinder n on piston N. This keeps valve O (shown open in Figure 3) seated securely against the bottom board on which the pipe stands, thus preventing the pipe from speaking.
When the key is "off" and the stop is "on," the position of the teeter-totter pitman is reversed. Then wind from the stop channel L is exhausted and wind from the key channel D pushes m1 up and m2 down, causing key channel wind to maintain pressure under the cylinder and the valve to stay closed.
When both key and stop are "on," i.e., channels exhausted, the pitman motor floats causing wind in the chest to push down on piston N and open valve O, allowing the pipe to speak. Duplexing is accomplished by a dual set of key and stop action channels D1, D2, L1, L2 as shown in Figure 4.
Gern's patent did not immediately become an innovation in the Schumpeterian sense, i.e., the commercial application of an invention, because all evidence indicates that he never used it in his work, nor did anyone else.10 Audsley laments that he has never seen a working model from which to make drawings, adding that although he was acquainted with Gern's instruments he had not examined the inside of the windchests in them.11 Gern most likely was dissuaded from utilizing his system because, in comparison with other mechanisms of the day, it proved impractical and uneconomical to build. Audsley appears to confirm this when he says: " . . . in our estimation, it is attended by several serious drawbacks, and must, in the manner in which it is fixed in the chest, be somewhat difficult to reach for cleaning or repairs."12
It must be emphasized that Gern did not call his invention a pitman action, a term designated much later and closely associated with the work of Ernest M. Skinner who is credited with further refinements and whose model became the definitive example of the system. The term pitman is not confined to organbuilding: it has been associated in antiquity with such diverse occupations as coal mining and saw milling and in engineering to denote mechanical linkage as in a steam engine or a steering column.13
The Skinner System
The concept of the pitman windchest was revived in 1897 by C. F. Brindley of Sheffield, England in a patent for a pneumatic pouch action which Sumner comments "anticipated the actual pitman action."14 The key to developing the pitman idea into a workable system, as reflected in the Brindley patent, was the pouch valve as opposed to Gern's piston valve. The pitman concept made its American debut in a Hutchings-Votey instrument in the Flatbush Dutch Reformed Church in Brooklyn in 1899. This was during Skinner's tenure with Hutchings and after his first journey to England. Wagner points out that this instrument: "probably used their pouch and lever action similar to what EMS used in his Opus 140 at Trinity Episcopal Cathedral in Cleveland with pitman action in 1906. It was only later that the pitman rail was put under the pouch rail."15 Skinner recognized the pivotal role of the pouch when he wrote: "My second acknowledgment is made to Casavant Frères of St. Hyacinthe, P.Q., who brought this type of motor (sic, i.e., pouch) to the state of refinement shown in the present manual chests and which, through their gracious courtesy, was given to me."16
The term pitman is attributed to Audsley who so named it because of the design of the action motor in the prototype of his day. "The Pitman-valve consists of a disc of fine, smooth leather firmly glued and tacked to the end of a short cylindrical stem of hard wood and well black-leaded to reduce friction to a minimum," he explained.17 The stem is the man and the orifice in which it moves is the pit (see diagram). The Skinner diagram is reproduced courtesy Norm Kinnaugh of the Reuter Organ Company. The American Organist describes it: "The name means man-in-a-pit: There is no Mr. Pitman connected with it—the man happens to be, instead, Mr. Ernest M. Skinner."18 Typically, Skinner took credit for the system: "The pitman stop action valve . . . is my contribution to this important factor in the composition of the organ," he wrote.19 The pouch valve and key and stop action pitman rail under the toeboard, perfected by Skinner, became the generic term for the system. It is characterized today by either a leather disc (without the formerly used wooden stem) or a hinged leather flap which acts as the relief valve/switch in exhausting the key and stop channels.
Summary
The triumph of the pitman action in the early decades of this century is attributable, apart from Skinner's influence, to its pronounced mechanical advantages during this period, in addition to the perceived weaknesses of the ventil system. Herbert Huestis, in an intriguing hypothesis, theorizes that organbuilding follows playing style, both then and now. In the first three decades of the twentieth century the crescendo pedal made possible the style of playing on the larger instruments characteristic of this period. This was the era of transcriptions as concert fare, and of large instruments built by Skinner, Möller, Austin and Kimball for municipal auditoriums and similar venues as well as for churches.20 As Wilson Barry comments: "Virgil Fox was Mr. Crescendo Pedal."21 The pitman windchest is optimally suited to the crescendo pedal, both in adding stops in the buildup to a powerful chorus and in reducing stops while holding a chord. Conversely, the ventil chest, with its much slower stop action, is woefully deficient in this respect. Momentary pitch variation in a ventil chest results in the transition period when wind pressure rises and falls as the ventil channel is charged and emptied. In addition, the pitman is adaptable to playing one rank as two stops; for example, a Diapason at eight and four foot pitches, and for playing a Fifteenth separately from a Mixture.
In retrospect, a ventil windchest is less complicated in layout and, with fewer borings, is less expensive to build than a pitman, although with the separate enclosure required for the stop action it is somewhat larger. The exception was the venerable Estey windchest, which could accommodate a 43 scale Diapason on the chest, and was even smaller than a pitman. Another drawback of the ventil is having wind on only one side of the leather stop action valve which seriously shortens its life. Only a small percentage of the time does a pitman pouch have wind on just one side. Furthermore, as Robert Vaughan points out, in former times when the blower was customarily located in the furnace room of the church, coal dust would be drawn into the organ action. Leather is permeable and as the wind filtered through the leather, as in a ventil stop action, the acidic compounds inherent in coal would be deposited in the leather hastening its demise. Finding organ leathers blackened with coal dust was a common experience of servicemen of yesteryear.22
The respected firms mentioned above continued to build the ventil windchest long after it was technically obsolete because they felt comfortable with it and, logically, took pride in their work and their innovations in the evolution of windchest action. The Kilgen key action, particularly when measured on a unit chest, has long been recognized by experts to be among the fastest key actions ever developed.23 These builders believed that whatever differences existed in stop action speed versus the pitman were either non-existent or minimal and, therefore, were of no consequence in the marketplace. As Huestis points out, they were builders of comparatively small instruments where the crescendo pedal was not a pivotal factor.24 Lacking personnel familiar with alternative systems they were fearful of failure. Windchest systems existed side by side in the organ industry because windchest cost is only a fraction of the total cost of building an instrument and, therefore, is not a determining factor. Otherwise, if windchest cost had been dominant, the Austin mechanism, so economically superior in design and manufacture, would have driven out the rest of the industry and monopolized the market.
August Gern, a relatively unknown and long-forgotten figure in nineteenth- century Continental organbuilding, deserves a small niche in the pantheon of notable organbuilders for his seminal contribution to the pitman action. His concept of using chest wind as the activating force was a milestone in the evolution of the pipe organ windchest and his uncanny switching mechanism laid the foundation for the highly successful pitman electropneumatic system.
