Thank you for your prompt response to my inquiry
about the various items I considered throwing out.
Of course, I'll keep the medical books. The diathermy
and ultraviolet machines I will also hold onto, if
only because they are too heavy for me to toss into a
5 ft high dumpster without assistance.

The diathermy machine now in the basement is a Raytheon
product dating from about 1950. It most likely contains
electronic devices long since superseded; I haven't
investigated. The original "Kurzwellenapparat",  which
my parents discarded when they acquired the Raytheon machine,
was a museum piece. Like the original Marconi transmitters,
it generated radio waves from high voltage spark gaps.
The ensuing electrical arcs produced a broad spectrum of
electromagnetic waves, disrupting radio-reception in 
radius of hundreds, - perhaps thousands of feet. Some
of the radio energy was conducted by means of cables to
flexible metal screens of various sizes, enclosed in 
rubber envelopes. These "electrodes" were strapped with
broad rubber tapes to the limbs or to the trunk of the
patient, never to the head. When the machine was turned on,
there was a loud hissing noise, the odor of ozone permeated
the room and the patient experienced a feeling of deep warmth
in the part of the body being irradiated. It was latter day
Mesmerism. The theory, that heat dilated blood vessels,
improved perfusion and metabolism.  For the patients it
was a pleasant experience, not at all painful, good for
"arthritis", "fibromyalgia", "rheumatism", or other
non-descript aches and pains. For the doctor, a reliable
source of cash flow. The Raytheon machine generated, no
longer by spark gaps, but by means of a specially designed
electrical oscillator called, if I remember correctly, a
"magnetron", - offspring of the WW II radar transmitter, -
a narrow spectrum of electromagnetic radiation which was
directed to the body part to be treated by means of microwave
reflectors positioned some inches from the skin, much inferior
to the physical contact of electrodes strapped to the body.
The Raytheon medical radar reflectors are devices which you 
will see when you're next in Konnarock.

"Die Hoehensonnenlampe" was an achievement of pre-war German
electronic technology. At its base, a huge transformer to what
I assume is low voltage, very high amperage current which
is fed into an exquisitely designed quartz electrode in which
there is formed an arc so bright that all persons in the room,
not only the patient, must wear protective glasses. The patient,
undressed, reclines on the couch about 1 meter below the arc,
which produces in untanned skin an ultraviolet burn within a
minute or two. Treatments, given once or twice weekly, are 
progressively lengthened and may be repeated until the body
is deeply tanned. Much less expensive than a month auf Sylt,
and probably quite effective in preventing rickets in city
children whose life-style precludes exposure to the sun.
Probably in part because of the southern latitude, ultraviolet
therapy never did catch on in Konnarock where sunlight was not
in so short supply as in North Germany.