It's a given to me that they played with the experiment many times before running the official experiment that is reported. For instance they would have optimized the temperature at which to run the device in order to optimize the temperature gain.
Sure, it is a lot easier to imagine all sorts of things that might have happened to lend credibility to your narrative. Competent experimenters, however, don't leave those details out of their report.
This temperature would correspond to a certain dial setting on the Variac.
The point is that no, no it wouldn't. There is enough variability of conditions that continual measurement would be required to confirm power input and temperature.
Given this variac setting they checked (confirmed) the voltage with the multimeter. Then after rearrranging the multimeter wires they would check the current. This is all before the experiment would even begin. They would establish that given this setup both the voltage and current repeatedly held steady for an arbitrary amount of time.
There is nothing in the report to support your fantasy. And it is not simply "rearranging the multimeter wires" to measure current; it involves disconnecting the heater from the variac. The heater is powered off while things are rearranged...not that that would affect anything, right?
Then they ran the official experiment and simply assumed this constancy.
That is not the best way to lend credence to the report, to claim Thermacore assumed a result. It is almost like you are saying Thermacore didn't do the experiment at all.
There would be no reason for it to change.
Never run a real experiment, have you? Things change, and they change whether you can imagine a reason for it or not.
So when the paper says, "The heating power was calculated from these measured values and remained constant throughout the test" it may be saying they just left it alone at a constant.
Let's stick to what was written. The report claims the measured values were constant throughout the experiment, not that they were assumed to remain constant.
Really, you don't know that.
Yes, I do know that. Mills reported results from a device incapable of measuring those results. Thermacore cited capabilities of the device it was using that the device didn't have.
If you look at the particular variac used, judging by its dial it looks continuous to me. Here's a similar one in action:
https://www.youtube.com/watch?v=E4lxc6cgw8E
Well, looks can be deceiving. Nonetheless, I overstated the "discrete steps" condition. The variac spans more windings at a time a carbon brush than I recalled; it results in an adjustment that is closer to continuous than I was thinking.
I acknowledge my mistake.
As I've said before I don't think they had need to monitor the current during the official experiment.
That would constitute either incompetence or fraud on Thermacore's part.
About any small varying voltage from the power grid, I would have thought the variac would correct for that.
You have made it clear you have assumed a lot of things. Competent scientists measure. (And despite your assumption, variacs are not voltage regulators.)
The 50 watts of claimed excess heat would indeed have altered the resistance of the heater coil. The experiment did not account for this. It would have increased the resistance of the heater coil, hence lowering the power delivered to the heater. How much would it have increased the resistance?
Since the temperature coefficient of resistance for Nichrome is low, at .0004 /C, the temperature rise of 81 degrees going from a nominal 14.4 ohm resistance heater coil would increase the resistance by 14.4 ohms * .0004 * 81 =~ . 47 ohms. So not that much.
You are assuming again. You have assumed all sorts of things about the heater temperature, the heat transfer mechanisms and the heat dissipation to the environment, and so on.
Experimenters don't assume. Well, the competent ones don't.
As I understand it the paper wasn't intended for publication and so was lacking the detail or rigour that might normally be present. One has to read between the lines a bit. But it conveys in short form the basic idea and the results nicely enough that if a potential sponsor were to see it, the experiment could be taken to the next level.
This seems to have happened when the Airforce sponsored the much more thorough 1994 report.
As I understand it, the paper is a farce, more likely a fraud, and perhaps describes something that didn't actually happen. We both agree, though, that the report might hook a potential sponsor.