CaptainHowdy mentioned the example of crematory ovens in connection with the incineration of bodies. This is a good direction for this discussion to develop, although of course cremation in an oven differs greatly from open air cremation. In speaking of cremation in ovens, we are leaving the Reinhardt camps and focusing our attention on Auschwitz and Majdanek.
I have already explained that aerial photos show that while open air cremation did take place at Auschwitz-Birkenau, its scale was quite modest. The Auschwitz open air incinerations might have been capable of incinerating perhaps dozens of bodies per day, but they certainly did not incinerate thousands of bodies per day. This means that if the flurry of extermination alleged to have taken place at Auschwitz really occurred, then the bodies (up to 10,000 per day) must have been disposed of almost entirely in the crematory ovens. For an explanation of how the system supposedly worked, and for an intuitive look at the problem of cremation capacity, the video
Auschwitz: the surprising hidden truth is highly valuable.
Birkenau had 46 muffles for cremation - five triple-muffle ovens in kremas II and III, and an 8-muffle oven (in 2 x 4 configuration) in krema IV and V. By 1944 the 6 muffles of the main camp were no longer in service. There is also agreement on both sides of the holocaust debate that krema IV was no longer in service in 1944. This reduces the maximum number of muffles available to 38.
Now, how many bodies could these ovens have cremated, and how much fuel would it have taken? And what about the need for repairs?
Let's start with the issue of cremation capacity. How long does it take for a crematory oven to burn a body? We might start by looking at the performance of modern crematory ovens. For instance, the top of the line model from
Matthews Cremation advertises a capacity of up to 15 cremations in 18 hours
We might also examine the scientific literature. One of the best sources for the duration of cremation is the paper
The degree of destruction of human bodies in relation to the duration of the fire, which can be downloaded
here. It shows quite clearly that the main cremation phase can be expected to take an hour or so. A cremation is not complete after the main cremation, but if the oven is equipped with a secondary combustion chamber into which the remains can fall (as the Auschwitz ovens were) a new body can be introduced once the main cremation of the last one is finished.
Now, compare this to the witness testimonies from "sonderkommando" witnesses, who claim (generally speaking) that several corpses could be burned in one muffle in around 20 minutes. These testimonies are presented in a comprehensive fashion in chapter 8.8.7 (begins on p. 310) of Carlo Mattogno's book
Auschwitz: the case for sanity. It's clear that the witnesses did not give a truthful account of cremation.
Moreover, since the 38 muffles in service in 1944 could have cremated only one body per hour, even if we assume (contrary to fact) that they could operate 24 hours per day they could only have cremated 24 * 38 = 912 bodies per day. Adding in the contribution of the open air cremations (likely a few dozen a day at the very most) we come to a cremation capacity at Birkenau in 1944 of no more than 1,000 bodies per day. Disposing of the 10,000 bodies per day that Birkenau allegedly faced, or even with an averaged out rate of some 5,000 bodies per day, would have been completely impossible.
There are no documents of witness accounts to support some alternative body disposal scheme, such as shipping the bodies out on trucks to some alternate body disposal site. All testimonies on body disposal explicitly state that the bodies of all of the killed were disposed of at the camp. Since it was not possible to dispose of the number allegedly killed, and since the bodies were clearly not left there to pile up, we can conclude that the claims made about the extermination of the Hungarian Jews and other groups of Jews at Birkenau in 1944 at the rate of several thousand per day are false.
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It is worth summarizing the background to the holocaust cremation debate - with respect to cremation ovens this time, not open air cremation. With any luck, someone will engage in some background reading and avoid repeating certain silly errors.
The historical starting point to this debate came when revisionists asked cremation professionals about holocaust cremation claims, and found that said professionals supported revisionist claims. Perhaps the first such case was
Ivan Lagace, who testified at the Zundel trial. As Lagace did not fully understand the particular design of the Auschwitz crematory ovens, some of his statements are erroneous, but his testimony is still worthwhile as an example of how a cremation professional reacts when confronted with holocaust cremation claims.
Another cremation professional to discuss holocaust cremation claims is found in
this video, in the segment beginning at 31:35. Again, the discussion is not as detailed as one might hope, but the interview is still valuable for the opportunity of seeing a professional's response to the claims made about cremation during the holocaust. It's also worth watching the witness claim about gassing and pit cremation starting at 28:50 (cremation part starts at 30:15).
The first person to look in detail into the German cremation technology of the third Reich was Carlo Mattogno. His article in the anthology
Dissecting the Holocaust (p. 373ff) is an excellent starting point. From the orthodox standpoint, the only major critique of revisionist arguments is the work of John C. Zimmerman, who published two articles attacking Mattogno's writings. (They can be found on the holocaust history project website, but at the moment the site seems to be down.) Mattogno responded in two articles of his own, after the second of which Zimmerman failed to reply. Both of Mattogno's articles replying to Zimmerman were reproduced in the book
Auschwitz Lies, p. 87ff.
A somewhat more detailed treatment of the Auschwitz crematories is found in chapter 8 of
Auschwitz: the case for sanity. Finally, Mattogno's full study on the crematories of Auschwitz (in two volumes) has been published in Italian, but is not yet out in English. Orthodox holocaust writers have not had anything significant to offer on the topic of cremations in crematory ovens since John C. Zimmerman lost his debate with Carlo Mattogno.