One of the HotCat Paper authors, Torbjörn Hartman, has commented in more detail about the checks he personally made to reduce the chance of deception on the power input circuit. The following is a Google translation with some spelling corrections and with thanks to Jed Rothwell on Vortex who received the link from a Swedish journalist. It is good to see that Hartman approached the task with an appropriate level of caution and interesting to see that a reasonable amount remains. Even so, this is another small indicator that allows us to retain and build a measure of hope.
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Remember that there were not only three clamps to measure the current on three phases but also four connectors to measure the voltage on the three phases and the zero/ground line. The protective ground line was not used and laid curled up on the bench. The only possibility to fool the power-meter then is to raise the DC voltage on all the four lines but that also means that the current must have an other way to leave the system and I tried to find such hidden connections when we were there. The control box had no connections through the wood on the table. All cables in and out were accounted for. The E-cat was just lying on the metal frame that was only free-standing on the floor with no cables going to it. The little socket, where the mains cables from the wall connector where connected with the cables to the box and where we had the clamps, was screwed to the wood of the bench but there was no screws going through the metal sheet under the bench. The sheet showed no marks on it under the interesting parts (or elsewhere as I remember it). Of course, if the white little socket was rigged inside and the metal screws was long enough to go just through the wood, touching the metal sheet underneath, then the bench itself could lead current. I do not remember if I actually checked the bench frame for cables connected to it but I probably did. However, I have a close-up picture of the socket and it looks normal and the screws appear to be of normal size. I also have pictures of all the connectors going to the powermeter and of the frame on the floor. I took a picture every day of the connectors and cables to the powermeter in case anyone would tamper with them when we were out.
I lifted the control box to check what was under it and when doing so I tried to measure the weight and it is much lighter than a car battery. The box itself has a weight, of course, and what is in it can not be much.
All these observations take away a number of ways to tamper with our measurements but there can still be things that we “didn’t think of” and that is the reason why we only can claim “indications of” and not “proof of” anomalous heat production. We must have more control over the whole situation before we can talk about proof.
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