Cylinder / Dictation (Ediphone blanks etc.)

2026.01.05
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Cylinder / Dictation (Ediphone blanks etc.)

Image credit: Unknown author/US National Park Service/Public domain (based on information from Wikimedia Commons)

Cylinders/Dictation (such as Ediphone blanks) are a type of media for dictation that is distinct from commercially available cylinders for entertainment. They were used in office workflows, where executives would record what they dictated onto the cylinder, which a secretary (typist) would play back and transcribe. Dictation cylinders are not a medium for selling pre-made music or entertainment content; they are practical items designed for users to record themselves, erase (scrape) it, and reuse it afterward. Because they are difficult to distribute as "works" using labels or catalog numbers, existing recordings rely on chance preservation, and their content tends to be primarily personal or business-related.
In this category, we will organize the characteristics of the format, not only considering blanks for Edison-style Ediphones, but also similar dictation cylinders from the same era (including other companies' standards and compatible products).

Features (blank cylinder)

Image credit: Unknown author/US National Park Service/Public domain (based on information from Wikimedia Commons)

Many Dictation "blanks" are supplied in an unrecorded state. The recording surface is essentially smooth, and a sound groove is carved into the surface during recording, leaving the speech or audio as a physical groove.
After recording, the surface was thinly shaved with a special shaving device to make it smooth so that it could be used for recording again. This "reusability" is at the core of understanding the format, as it is quite different from commercially available entertainment cylinders, whose contents are fixed at the time of manufacture.

How to distinguish (appearance, markings, recording surface)

Image credit: Unknown author / Published before 1923 (Public domain in the United States) / Public domain (based on information posted on Wikimedia Commons)

Dictation cylinders often have simple cases and labels, and information about the work or performer's name may not be printed on the exterior. Clues to distinguishing them include the condition of the recording surface (whether it has been recorded or has been scraped and reused), any markings indicating its purpose (such as "Dictation" or "Ediphone"), and the storage box and accompanying documents (such as the company control number, department name, or date memo).
Additionally, depending on the angle of the light, the condition of the spiral grooves, shaving marks from being scraped off for reuse, and pitch irregularities may become more visible.

Recording, playback and operation (workflow)

Image credit: Harris & Ewing (Library of Congress) / Public domain (based on information from Wikimedia Commons)

A typical operation consisted of a recording (dictation) machine, a transcription (playback) machine, and an erasing (shaving) machine: a dictator recorded short segments, a typist transcribed them, pausing and rewinding as necessary, and the completed cylinder was scraped clean for reuse and ready for the next recording.
Because of this operational design, the same "cylinder" may have different dimensions, materials, and accessories than those used for home recording or entertainment, and it is important to note that the boundaries of formats have fluctuated throughout history.

Precautions for handling and storage (especially wax-based products)

Image credit: Unknown photographer/Public domain (based on information posted on Wikimedia Commons)

Dictation blanks are designed to be scraped and reused, so many have a relatively soft surface and are susceptible to heat, pressure, and dirt. Touching the recording surface with your fingers can cause noise and deterioration, so the safest way to hold the blank is by supporting the edges and inside.
Store in an environment with minimal temperature change, avoiding direct sunlight, high temperatures, excessive dryness, and mold growth. If there are any notes on the exterior (date, time, department, summary of contents), store them together with the cylinder body, rather than separating them, and this will greatly increase the value of the document.

Significance as a collection item (including value beyond music history)

Image credit: National Archives and Records Administration (NARA)/Public domain (based on information from Wikimedia Commons)

Apart from the genealogy of commercial audio recordings, dictation cylinders can also serve as primary sources that show how voices were used, preserved, and processed in the workplace. They can be used not only for corporate history, labor history, and technological history, but also for the study of spoken language (phrases, dialects, specialized vocabulary, and meeting procedures), and, when personal recordings from the home are mixed in, they can also be interpreted as fragments of life history.
On the other hand, because the content may contain personal or confidential information, decisions regarding publication, quoting, and transcription must be made carefully, taking into account modern ethics and rights.

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