Preserving Historic Skinner Pipework

A rank is significant because its voicing and scaling record how the firm worked, and that record cannot be recovered from a stoplist. Létourneau’s technical analysis of Aeolian-Skinner Opus 1257 of 1955, published in The Diapason, reported that G. Donald Harrison favored narrow basses and broader trebles with a fine, refined style of voicing, and that the reed stops used small to average scaling on generally high wind pressures with a surprising variety of shallot types. That is a description of one instrument by one firm, not a formula for the company’s output, and the variety it found inside a single organ is the point: the evidence lives in the pipes, and a rank that has been discarded or recut no longer carries it.

The American Theatre Organ Society’s restoration guidelines, adopted in July 1992, state at section 3.B that ‘An effort should be made to ascertain the original pitch and voicing’, which makes finding the original voicing state a prerequisite step rather than an optional one. The guideline does not prescribe how that is to be done, and it was written for theatre organs; it is cited here because it puts the evidential question first, ahead of any treatment.

Scale records for Aeolian-Skinner pipework survive in published form. As of August 31, 2026, the Organ Media Foundation publishes an Aeolian-Skinner Pipe Scales Archive under a Creative Commons Attribution-NonCommercial license, presenting eleven categories of pipe scale documentation, including chorus and non-chorus reeds, pedal reeds and flues, principals, open and tapered flutes, capped flutes, strings and hybrid ranks, drawn from a binder of Aeolian-Skinner pipe shop pages and a notebook compiled for pipe shop foreman Tommy Anderson, who held that post from 1957 to 1967. The archive is a record of the Aeolian-Skinner shop, and the notebook is tied to a foreman whose tenure ran from 1957 to 1967; it does not by itself establish what the Skinner Organ Company did before 1932.

Firm records are held privately as well. The A. Thompson-Allen Company states that its restoration practice consults original builders’ records wherever possible, that it holds preserved Skinner Organ Company documents, and that this enables accurate reproduction of entire ranks of missing pipework. That is the firm’s own description of its practice on an undated page, not an independent verification, and it does not establish what survives for any particular instrument.

How much original material survives is the other half of significance, and in the documented cases the answer is far less than the builder’s name implies. The re-creation account of Skinner Organ Company Opus 751, built in 1929 with 36 ranks and published in The Diapason, reports that a 1965 rebuild left only twelve of the original ranks intact, reduced the Great to 32 notes to form a new Pedal division, repitched or converted twelve ranks, replaced the original Harmonic Mixture with a one-foot Scharff on six-inch wind, discarded stops including the Cello and Waldhorn, and enlarged the instrument to 64 ranks, of which 18 were mixtures. The University of Chicago records that during the mid-1970s much of what it calls the original Skinner pipework of Opus 634 at Rockefeller Memorial Chapel was removed and sold off to make way for Baroque additions.

Neither case says anything about how common such alteration was. Each shows that a surviving original rank may be one of a small remainder, and that is what puts a value on it. The reasons instruments were altered in that period are a separate subject from the treatment of what survives, and the identity of the stops themselves, including the orchestral voices and their names, belongs to Skinner Orchestral Stops and Distinctive Stop Names.

Each body puts repair first. The British Institute of Organ Studies (BIOS), on a Care and Conservation page dated 5 October 2024, states that ‘all original components should be preserved and properly repaired’ and that ‘components that have been severely damaged or altered beyond repair may be replaced by reproductions’. The American Theatre Organ Society (ATOS), in guidelines adopted in July 1992 and scoped to theatre organs, states that ‘Pipework should be carefully repaired by a professional pipemaker’ and that original pipes must be retained whenever feasible through proper repair. The New Zealand Organ Preservation Trust (NZOPT), in its Guidelines for the Conservation and Restoration of Pipe Organs (June 2002, Issue A, clause 3.A.B), states that ‘Pipework should be carefully repaired by a professional’. The ATOS and NZOPT wording is near-identical, which suggests a shared drafting lineage rather than two independent findings; both restrict the repair to a professional, and ATOS names the professional pipemaker specifically. All three are framed for historic pipework generally rather than for any one builder.

Where the components are reed parts, the guidance is not unanimous. BIOS requires preservation and repair of all original components, with reproduction only where a component is beyond repair, and its published care and conservation guidance carries no reed-specific clause on tongues or shallots. The Organ Historical Trust of Australia’s conservation guide (September 1998, written for New South Wales) states at section 4.4.1, among alterations that change the tonal structure and are to be removed in restoration, that ‘with reeds, non-original leathering and voicing aids are to be removed’, a clause that reaches only material demonstrably not original. A 1986 article by Dan Barton in Theatre Organ treats making and fitting a replacement reed tongue as ordinary repair, while stating in the same article that a voicer’s qualification takes several years of apprenticeship and advising that failed attempts be handed to professionals. Whether a damaged reed component in a historic instrument is repaired, replaced or removed is therefore a question these sources answer differently, and none of the three positions is adopted here.

When a pipe is missing or beyond repair, each body requires the replacement to match the original in material and construction. ATOS states that ‘Replacements for missing pipes are to be made of the same material and construction details as the originals.’ NZOPT, in the same clause 3.A.B, requires ‘replacement for missing pipes being made of the same material and construction details as the originals’. BIOS requires reproductions to be made ‘in a manner consistent with the original work, both in materials used and method of construction’. What replacement in kind looks like in a documented project, and how it differs from an addition, is taken up under replication below.

On original pipework, the standards limit voicing to re-regulation. BIOS, on its Pipework, Console and Fittings page dated 12 October 2024, states that in conservation work ‘Voicing should be limited to the re-regulation of repaired pipes and the voicing of any replacement pipes in the style of the originals.’ NZOPT clause 3.A.B states that ‘Altering of original pipework should be limited to the re-regulation and resetting of speech of the pipes. Voicing of replacement pipes must be carried out in the style of the remaining originals.’ The NZOPT wording explicitly names resetting of speech, which is slightly broader than BIOS’s re-regulation of repaired pipes; further tonal alteration of original pipework falls outside what either body describes as conservation practice.

Greenleaf Organ Company, a service firm, distinguishes revoicing from voicing as applying ‘many of the same decisions as voicing on pipework that has already been playing in an instrument’, locating the difference in the object rather than in the technique. The conservation bodies draw the line differently, by what is permitted on original material rather than by technique, and a proposal should be read against their line, not the firm’s.

Some flue-pipe adjustments can be reversed and some cannot, and the published sources sort them as follows. Michael McNeil, writing on the art of voicing in The Diapason, describes languid height as reversible by tapping; opening a toe hole is progressive and one-way in the opening direction, though the foot can be re-coned or plugged, a possibility implied by the adjustable plug of a 1920 patent by Edwin B. Hedges assigned to the Samuel Pierce Organ Pipe Company; raising a cut-up removes metal and is stated by McNeil to be ‘not easily reversible’. No single published source sets out that classification as a whole: it draws on a trade article, a patent, a controlled experiment and a conservation guideline, each limb carries the qualification of its own source, and every adjustment in it is described as trained-voicer work. It is set out so that an owner can tell which lines of a proposal touch recoverable ground, not as a guide to doing any of it.

Cutting and nicking are the irreversible categories. McNeil (The Diapason, March 2025) states that cutting pipes to final pitch cannot be undone without resoldering work, which makes pipe-length alteration a distinct irreversible category separate from mouth-geometry voicing. On nicking, Niclas Fredriksson and Matthias Scholz (International Symposium on Musical Acoustics, Barcelona, 2007) made identical pipes, applied various nicks, then attempted removal by known techniques, and concluded that although ‘the overall sound character of a pipe without nicks can be regained’, ‘exactly reversing the process seems not possible’. The experiment used newly made pipes rather than historic ones; it bears directly on the physics of de-nicking, its application to original pipework is an inference, and the conservation bodies’ guidance does not cite it.

Whether de-nicking is even permitted on historic pipework is unsettled, and both readings are carried here. Fredriksson and Scholz show, on purpose-built pipes, that the unnicked sound character can be regained while the operation cannot be exactly reversed, which is the experimental basis for treating nicking as practically irreversible even though a removal technique exists. BIOS, ATOS and NZOPT each restrict alteration of original pipework to re-regulation and, in the NZOPT wording, resetting of speech, without addressing the removal of nicks added later. Whether removing later nicking from a historic pipe counts as permitted restoration or as prohibited revoicing is not settled by any of them.

The original means of tuning is itself protected. BIOS states that ‘The original means of tuning should be preserved where this survives’ and that ‘Tuning slides should not be fitted if this involves the cutting of any pipe’, drawing an explicit line at an irreversible cut to original material. NZOPT (2002, clause 3.A.B) states that ‘The original means of tuning should be preserved wherever possible.’ In BIOS’s terms, fitting slides where that requires cutting an original pipe is an alteration of original material, whatever tuning convenience is gained.

BIOS adds, on its Care and Conservation page, that ‘organs should not be tuned more often than is required for acceptable performance’, and that ‘organ pipes are made of soft metal and can be easily damaged by inexpert handling’. Tuning frequency and handling are therefore part of the preservation question, not only the voicing room.

In the documented projects, the first move was to recover original pipes that had been removed rather than to build new ones. The University of Chicago’s Rockefeller Memorial Chapel records that in the 2005-2006 restoration of its Opus 634 by the Schantz Organ Company, original pipes held in storage were restored, and that Schantz was selected on the strength of large projects such as the relocation and restoration of the Severance Hall organ in Cleveland. The Church of Jesus Christ of Latter-day Saints Newsroom reported in October 2025 that two sets of pipes removed from the Salt Lake Tabernacle organ in the 1970s are being reintroduced to restore string voices missing for decades, and that the restoration team consulted letters, documents and old plans to restore the instrument to its intended form. That is an owner’s announcement of work in progress, describing inspection and repair continuing for years; it does not establish where the work stands now.

Both accounts are the owning institutions’ descriptions of their own projects. Each establishes that recovery was possible in that case, not that stored pipes exist for any other instrument.

Replicas were built only where a rank was gone or beyond saving. Rockefeller Memorial Chapel states that replica pipes were carefully constructed to replace those ranks which had either been lost or severely damaged, after much of the original pipework had been removed and sold off in the mid-1970s. A replica built for a lost or damaged rank is new material made in the style of the original, and it is not the instrument’s original fabric; the conservation bodies’ replacement-in-kind requirement governs how it is made, not what it is. The distinction carries into how a project is described afterward: an instrument with restored originals and replicas for the lost ranks is not an instrument with all of its original pipework.

New ranks added in a builder’s style are a third category, separate from both originals and replicas. The same chapel account records that twenty-two new ranks were added in the style of other Skinner university organs, bringing the instrument to 132 ranks and 8,565 pipes, alongside a completely rebuilt chancel console inside its original Goodhue-designed case, a new two-manual gallery console, and restoration of all of what the chapel calls the original Skinner chancel windchests and reservoirs. Those twenty-two ranks are new work modeled on other instruments, not reconstructions of anything Opus 634 had lost, and the two must not be run together in a proposal or a program note.

The windchest and reservoir work in that project belongs to Skinner Pitman and Offset Chests, Leather, and Failure Modes, and the question of what state a project of that scale restores an organ to belongs to Restoring or Rebuilding an Altered Skinner Organ.

A faithful replica starts from the original scale and the original metal. Scale documentation for Aeolian-Skinner work exists in the Organ Media Foundation archive described above, and A. Thompson-Allen states that its preserved Skinner Organ Company documents enable accurate reproduction of entire ranks of missing pipework. Greenleaf Organ Company states that in restoration ‘we take particular care to use techniques and materials that would have been used in the original construction of the pipework, matching metal alloys and treatments where pipes must be replaced’; that is the firm’s description of its own practice and establishes neither compliance nor certification, but it is the same requirement the conservation bodies state.

What has not been located in accessible form, as of September 1, 2026, is a manufacturer-produced service or installation manual for Skinner Organ Company, Aeolian-Skinner or Ernest M. Skinner & Son instruments; the manufacturer-derived documentation that is publicly accessible consists of opus lists, factory stoplists, shop notes and pipe scales. That statement describes what was publicly accessible on that date and nothing more. The Organ Historical Society’s Aeolian-Skinner Organ Company Collection is arranged in four series whose names are not legible in its collection-level finding aid, so technical documentation may exist there or in unprocessed holdings, and an archive omission does not prove such documents never existed.

Wind pressure is part of what a replica is matched to, and the documented restoration treated it as a value to be recovered from the record. Létourneau reported that in restoring Aeolian-Skinner Opus 1257 the wind pressures were restored to the values in the 1955 specification, and its analysis of the same instrument recorded the reed stops on generally high wind pressures. ATOS’s requirement to ascertain the original pitch and voicing points the same way: the original operating state is something to be found in the specification and the surviving pipes, not assumed.

A firm’s stated aim matters as much as its materials, because replication is where a restorer can leave a signature. Schantz Organ Company states that ‘leaving our thumbprint or tonal signature is not the goal of the successful restorer’ and describes its approach as restoring pipework by recapitulating the voice of the original builder. That is a stated philosophy on the firm’s own service page, as read on September 2, 2026, not a demonstrated outcome, and it does not make Schantz or any other firm a successor to, or authorized by, the original builders.

The useful thing about a stated posture is that it can be written into a scope. Replicas voiced in the style of the remaining originals is the NZOPT and BIOS wording, and it is a requirement a committee can hold a proposal to.

Pipework is at risk whenever it leaves the instrument, and the scale of that risk is documented for whole organs. BIOS states that ‘organ pipes are made of soft metal and can be easily damaged by inexpert handling’. John Bishop, writing in The Diapason in March 2025 about the removal of the instrument his column identifies as Skinner Opus 635, calculated a requirement of sixty eight-foot crates and seventeen ten-foot crates, consuming 165 ten-foot boards of one inch by eight inches, forty-two sheets of OSB and 650 feet of foam. Those quantities belong to that one organ; they measure what a full removal involved in that case, and they are neither a rule of thumb for another instrument nor a packing instruction.

The Cleveland Orchestra’s archives record that the 1930 Norton Memorial Organ at Severance Hall, which they describe as an E. M. Skinner instrument of 94 ranks and 6,025 pipes, was housed at the Schantz Company from 1997 to 2000, with all pipes and machinery removed and reinstalled and new facade pipes built, and was reinstalled behind the stage in 2000 with a rededication in January 2001. In that case the pipework was away from the building from 1997 to 2000, which is why storage belongs in a project scope alongside the tonal work.

A large instrument can hold pipework older than its principal builder, and the older material is easy to overlook when the builder’s name is the only guide. The Salt Lake Tabernacle organ, as reported by its owner in October 2025, comprises 11,623 pipes and over 75,000 pieces being assessed; although the instrument was largely built in 1949 by the Aeolian-Skinner Organ Company under G. Donald Harrison, it incorporates a small amount of historic pipework tracing to the original construction by Joseph Ridges in the late 1860s. The source does not quantify that small amount, and the eras in that one instrument must be kept distinct in any assessment of what is significant. The same discipline applies to an instrument that has been through a rebuild like the one Opus 751 received: the ranks that survive may be from the original contract, from a later addition or from an earlier organ altogether, and a treatment chosen for one is not automatically right for the others.

The pipework decision begins with inspection and a written record rather than with a proposal. Which ranks are original, which are replicas or later additions, which have been cut, nicked or fitted with slides, and what the shop records and scale archives hold for the instrument are the questions that ATOS’s requirement to ascertain the original voicing and the documented recovery projects both put first. A scope written from that record can name what is to be repaired, what is to be replicated in kind and what is to be left alone, and it can be read against the published standards by anyone on the committee.

Where the pipework decision opens onto the larger question of what the whole instrument should be restored to, see Restoring or Rebuilding an Altered Skinner Organ; for the identity of the stops themselves, see Skinner Orchestral Stops and Distinctive Stop Names; and for the firms behind the name, see Skinner and Aeolian-Skinner.