Below are a few quotes from the Physics of the Primary State of Matter on Schappeller's secret electret sublimate.

The sublimate must be charged with electric current, after which, provided no power is taken from it, it will retain its charge as we saw in the case of the Electret; the Sublimate in this case is an energy sublimate (produced by the new plant referred to above), but this sublimate is bound to a composition of substances in the solid form with which the tubular coils are tightly filled.

The charging plant required is merely that necessary to give the required number of amperes, the plant being composed of the requisite generators and units, according to whether the grid current is available or an entirely different supply is required, or both as a "standby". Such plants will, of course, supply direct current.

The main cost of demonstrating the application to mechanical power lies in the purchase of the charging plants and standby sets, which latter are absolutely necessary for certain reasons, and also Schappeller's special plant for the production of the initial sublimate by occasioning transpiration, followed by condensation and sublimation, all in the energy form.

Let it therefore be clearly understood that any suggestion of small laboratory models or the like is out of the question or they would obviously have been used and the application of the Primary Force to mechanical power would long since have been tested out. The transpiration could not be produced by models and the essential sublimate could not therefore be produced except by a plant of certain minimum dimensions capable of producing transpiration, and this also applies to the Stator and Rotor which is obvious here when the design of the Stator is carefully examined.

There are three things I want to draw your attention to in which is part of the sublimate/electret process:

1) Transpiration is a process similar to evaporation and it occurs in plants.
2) Condensation is the change in the phase of matter from the gaseous phase (of an element/ chemical species) into liquid droplets or solid grains of the same element/ chemical species.
3) Sublimation is the transition of a substance from the solid phase to the gas phase without passing through an intermediate liquid phase.

IMO, the above three things are very similar to the process of creating aerogels. Aerogel is a manufactured material with the lowest bulk density of any known porous solid. It is derived from a gel in which the liquid component of the gel has been replaced with a gas. Aerogels are produced by extracting the liquid component of a gel through supercritical drying. This allows the liquid to be slowly drawn off without causing the solid matrix in the gel to collapse from capillary action, as would happen with conventional evaporation.

In Schappeller's lifetime, the creation of aerogels could only be done in the most sophisticated laboratories, thus the reason for this statement being found in the PP document, "small laboratory models or the like is out of the question".  Prof. Dr. Halimaton Hamdan, of the Dept of Chemistry at Universiti Teknologi Malaysia has patented a method of creating aerogel from rice husks at a fraction of the normal cost, and is known as Maerogel. Take note how the rice husk is burned on a heating plate at a temperature in the range of 650° C. to 700° C. with excess air until a white ash is obtained. Combustion at 700° C. produces the most reactive silica source which predominantly contains pure amorphous.  Aerogels were discovered in 1931, so Schappeller was more than likely aware of this discovery. 81 years later and we still aren't capable of getting the aerogels to the market with any kind of efficiency or at a reasonable cost, LOL.

Below is a quote from Professor Halimaton Hamdan in regards to (m)aerogels from rice husk in her publication on Nanomaterials as catalysts in the production of fine chemicals found on Page 3.

Silica aerogel is a potential substitute for silicon dioxide, the reigning dielectric. Silica aerogel offers a better way to keep the interconnecting wires from shorting across the narrow dividing space between transistors which avoid propagation delays and excessive crosstalk and subsequently may double computer speeds.
..........
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Maerogel; a silica aerogel which is directly prepared from rice husk (Figure 4) is a nanomaterial of a highly divided state and exhibits unconventional properties which offers more cost effective methods of production and application. Maerogel is more superior in quality than the current commercial TEOS aerogel.

A dielectric is an electrical insulator that may be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material, as in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization. Because of dielectric polarization, positive charges are displaced toward the field and negative charges shift in the opposite direction. This creates an internal electric field that partly compensates the external field inside the dielectric.

An Electret is a dielectric material that has a quasi-permanent electric charge or dipole polarisation. An electret generates internal and external electric fields, and is the electrostatic equivalent of a permanent magnet.

The maerogel is more superior in quality than the current commercial TEOS aerogel and has a potential to replace the reigning dielectric of silicon dioxide, in order to form one of the best electrets possible.  Maerogels may be able to reduce the cost by 80% as compared to other manufactured aerogels.

Here's a quote from page 126 of the PP document in reference to the initial stages in the formation of the earth's crust, which directly refers to the creation of a silica aerogel.

The marine life entered into the gaseous or vapour state, drawing or sucking in the carbon-static. The death of these vast organisms brought the peripheral film to the plastic or gel state; on becoming a solid having stable Space-form, it became virtually silica (this is describing a silica aerogel), and permutations of this in rock form were derivatives. Silica, being converted carbon, oxidised, the oxygen being present in abundance as the complementary stressfield.

In summary, silica aerogel is Schappeller's secret sublimate for his electret.  Schappeller needed a very strong electret for his prime mover, shown below, and the silica aerogels is the best solution and is a perfect match for what is described in the PP document. Here's a video showing a derivative of the silica maerogel in rock form, as described in the above quote, which used evaporation without the use of super critical drying.  Rice husks could be hard to obtain.  However, silica isn't limited to rice husks, as shown below.

Reference Link: Mindat Mineralogy Messageboard
"silica is deposited in the plants as amorphous, Opaline silica."
"Nettle and tobacco , for example, are rich by silica.
Some gem cutters use tobacco ashes as polishing reagent"

[Edit:] The red text inside the quote is my own comment and does not appear in the PP document.

Gravock

But then he "only" used the so called piezo-/pyro-(transducer)phenomen ?
Sincerely
            OCWL

Mostly to play with the new OCR program I translated this to English.  Attached is doc conradelctro put up - now in English.

We know what exactly what Karl Schappeller’s secret sublimate is from the papers of Louis Gfoellner Schappeller’s laboratory assistant. A group of us acquired the Gfoellner papers from his estate. The sublimate is a mixture of pitchblende and carbon melted  together by an radio frequency induction furnace.
Here is a letter dated 24 June 1927
“Nun hat Modi mit mehreren Metern, ja acht Meter lang en Wellen gearbeitet und mit Gfollner dies herausprobiert, wobei ich in Sorge um die Hantierenden war, denn ein Blitz ist leicht umgestellt und kann die FOhrung verlieren. Steine und Porzellan schmolzen, und ich wollte in Wien immer dazu anregen, dass der magnetostatische Schmelzapparat gebaut wird, um die Elektreten[-]Metalle zu erhalten, die uns vor Nachahmung schOtzen. Da dies noch nicht gelungen list], muss nun der Motor gebaut werden, der wohl auch so, aber doch [noch] nicht die Vollendung ist, die man braucht. Dass man Akkumulatoren und dergl. Platten schon trocken aufladt, ist auch kein Wunder, und hat uns die Natur im Radium die natOrliche Konsistenz der gebundenen Elektronenenergie vorgefOhrt. Eine Kombination im Uranerz und der Pechblende hat uns mit dem Radium bekannt gemacht und wir wissen, wie lange so ein Gramm Radium imstande ist zu strahlen. Das Radium ist ein kunstvoll geartetes Elektretenprodukt der Natur, ohne d[as] dem Zeitenstrom der Gegenwart auf keinem Gebiet der Technik ein Ganzes moglich ist, denn die Forscher und Erfinder sind wie Pilze aus der Erde geschossen, nachdem die ungeheuer vielseitige..." [/font]
Translation:-[/font]
“Our present (oscillator) models work at several meters (wavelength), eight meters long waves have been worked out and tested by Gfollner, and I was concerned about the handling, because a flash-over is easily caused and current can jump off the conductors. Stones and porcelain were fused, and I always wanted to encourage in Vienna that the special magnetostatic melting apparatus which is built to make the electrets – is used to obtain (ordinary) metals in order to protect us from imitation. As this task has not yet succeeded, the engine must now be built, probably so, but [still] is not the completion, one needs. One set of charged batteries and the like slabs are already dry, and is it not a miracle that nature has given us the natural radium in the natural consistency which then presents us with the bound electron energy. A combination of the uranium ore pitchblende, and has made us acquainted with the radium, and we know how long does a gram of radium is able to shine. The radium is an artfully special sort of Electret product of nature without  the limited life usually present in any field of art, a lot is possible because  researchers and inventors spring like mushrooms from the ground, as a result of the incredibly diverse literature that has suggested many applications…..”. [/font]
Mike

In my youth I knew Cyril Davson and also met Herbert Ruff who built various experimental bits for Schappeller and Gfoellner, Schappeller's Lab assistent.
Regarding Schappeller, the problem is you cannot even start from current electromagnetic theory. You have to start from the physics concept of entropy, that is that all energy degrades when used, it moves from the ordered state to a disordered state, but it is not created or destroyed, so for example you put fuel into a car engine and get energy, carbon dioxide and water out, the energy has become more disordered, an increase in entropy, so entropy may be seen as a measure of disorder.
On the other hand an apple tree takes muck, carbon dioxide, water and sunlight in and produces highly ordered  fruit (apples) and wood out, it takes relatively disordered substances in and uses highly ordered energy in the form of sunlight to produce fruit  etc. so sunlight may regarded as a source of order or negative entropy.
in conventional physics world all this negative entropy stuff was discussed by The father of quantum mechanics Erwin Schroedinger in his book "What is Life".  Energy cannot be destroyed only its entropy changes, or to put it another way, its state of order changes.
Schappeller’s machine is an negative entropy converter increasing order from disorder like a tree or plant, opposite to a car engine (and all modern machinery)  which produces disorder form a relatively order input in the form of hydrocarbon fuels created  by the life process of trees millions of years ago.
Schappeller was not alone. Rudoph Steiner the founder of the anthroposophy movement thought the same way:
Dr. Pfeiffer’s question to Steiner
« The method of science, in a materialistic sense, is based on
 analysis splitting apart (today atom-splitting and fusion etc.),
 disintegration, separation, dissecting and all the procedures which have
 to destroy and take apart, to work on the corpse rather than to grow, to
 develop, to synthesize. That the human mind was captured by these
 methods of braking apart: in that I saw the source of our present
 situation.
My question therefore is this:
" Is it possible to find another force or energy in nature,
 which does not have in itself the principle of atomising and splitting but rather
 builds up, synthesizes. Is there a constructive force, which
 makes things alive and grow. Can we develop and build up adequate methods of
 investigation, eventually using this force for another type of technology, applied
 to drive machines, and because of the inner nature of this force or
 energy we might be able to create another technology fostering
 constructive thinking of man rather than destructive thinking. This
 force must have the impulse of life, of organisation within itself opposite to 
 the so-called physical energies which have a splitting, separating trend
 within themselves. My question to Rudolf Steiner in 1920 and spring 1921
 therefore was:-[size=78%] [/size]
does such a force or source of energy exist? Can it be
 demonstrated? Could an altruistic technology be build upon it?
 When these questions formed themselves in my mind I met in Günther
 Wachsmuth a life long friend who had pondered about exactly the same problems.
 Some discussion with Rudolf Steiner were carried out individually, often we had discussions both together with R. Steiner.
 
 
My questions To Rudolph Steiner were answered as follows:-

 Yes, such a force exists, but is not yet discovered. It is what is
 generally known the ether (not the physical ether) but the force which
 makes things grow, lives for instance in the seed as Samenkraft (growth force).
Before you can work with this force you must demonstrate its presence. As we
 have reagents in chemistry, so you must find a reagent for the etheric
 force. This force is also called formative etheric force because it is the force
 which creates the form, shape, pattern of all living things and growth".
So Schappeller was not alone
Mike

To show that nobody was playing games during WW2 here attached is a copy of an SS organised visit  to Schappeller by Professors Boethe and Esau.


Mike

[size=78%]
[/size]

Das Radium ist ein kunstvoll  Elektretenprodukt der Natur, ohne d[as] dem Zeitenstrom der Gegenwart auf keinem Gebiet der Technik ein Ganzes moglich ist, denn die Forscher und Erfinder sind wie Pilze aus der Erde geschossen, nachdem die ungeheuer vielseitige Literatur sie angeregt hat.
Es ist seit Eguchi die Kunst gefunden, die Energie einzubinden in fremden Stoff, auch die Elektretenmasse list] kein Geheimnis [mehrJ, doch nur ein Vorstufchen zum Bau der anderen, der Radium-Elektreten, welche in Hinkunft multiplizierende Funken aus Kohlenstoff mit hohem Druck von innen nach aussen sind. Diese Kraft ist im lapis philosophorum, den Sie aus der Theorie von dem Hamburger Chemiker Dr. Ferd[inand] Maack kennen, unentbehrlich, denn er hindert aile anderen ihm zustromenden Schwingungen, die er absorbiert und unmoglich macht, daher [sind] die Zentralen in [an] jedem art notwendig. Und wer Augen hat, sehe, was ich darunter andeute und wegen der unreifen Vorbereitung unter uns noch weglassen muss, bis die Elektronen-Theorie voll und ganz erfasst wurde....


Translation:-

The radium is an ornately a special Elektret-produkt of nature, without the time stream of the present, in any field of technology a lot is possible , because the researchers and inventors are like mushrooms shot from the earth, after the tremendously versatile Literature has inspired them.
  Eguchi found the art to integrate energy into foreign substance , the Elektret list is no secret any more , but only a example for the construction of the other, the radium - electrets , which multiply in the future sparks of carbon at high pressure from inside to the outside . This force is in lapis philosophorum (philosopher's stone) as you know from the theory of the Hamburg chemist Dr. Ferdinand  Maack,  it is essential because it prevents ail other inflowing oscillations , which it absorbs and make them impossible so act as  centers of any kind as necessary. And those who have eyes to see what I have suggested and also because of immature preparation I must omit details until the electron theory has been fully recognized ....