Hallo BB,

"abdecken" hat mehrere Bedeutungen, deren eine darin besteht, daß eine Deckung/Bedeckung entfernt wird.

Rhine deckte die Karten nicht einzeln auf, er legte die jeweils oberste Karte des Kartenstapels - immer noch mit dem Symbol nach unten - auf einen anderen Kartenstapel:

"In this series with subject HP, I was myself the recorder and observer. Twenty-five packs of fresh-
ly printed cards were used in the series, and the subject had never seen them before. The packs were
laid on the table in a stack at the beginning of a sitting, and each was used for three runs, with the ex-
ception of two that were used only once and five that were used only twice. A pack was handed to the
subject by the observer, and he was asked to shuffle it. The shuffling was always thorough. Then I cut the
pack and placed it before the subject, or allowed him to hold it face downward in his hand, removing
each card still face downward to another pile on the table after he called it. No one looked at the faces
of the cards until the end of the run. There had been no opportunity for anyone to learn the order of the
cards nor to study them for sensory cues. The cards were checked after the completion of each run of 25."

https://archives.parapsych.org/bitstream/123456789/23/1/04%20Rhine%20Basic%20Experiments%20in%20ESP.pdf

Gruß
Ulrich,
Haare spaltend, Worte klaubend