This is picture taken from 'Ignition' book by John D Clarke.

enter image description here

I am bewildered after seeing picture that I can't find wrong in this picture. I guess this is related to the structure of mach diamonds.

  • 7
    $\begingroup$ For those not familiar with this book, it's highly entertaining, very informative, and provide excellent insights into some of the engineering and chemistry challenges that make "rocket science" a cliche. $\endgroup$ Mar 20, 2020 at 13:29
  • 2
    $\begingroup$ It is no jet-engine and there is no afterburner, it is a rocket engine. $\endgroup$
    – Uwe
    Mar 21, 2020 at 17:55
  • 3
    $\begingroup$ It's a fascinating book. I never believed that formulating fuels and oxidizers could be so difficult... $\endgroup$
    – xxavier
    Mar 21, 2020 at 18:11
  • $\begingroup$ Since the error is related to the printing edition, I'd suggest to at least include the problematic edition (paperback? digital? Kindle edition as commented?) to make it clearer. $\endgroup$
    – Andrew T.
    Mar 22, 2020 at 19:01

1 Answer 1


I think there's a mix-up in the labeling of the photo.

Here's the photo and caption from a copy of "Ignition" that I just downloaded:

enter image description here

Here's the photo and caption from the next page:

enter image description here

Seen together, those two photos and captions make sense.

Somebody mixed up the images and the captions in the copy you are reading.

  • 4
    $\begingroup$ My 2018 third paperback printing matches this answer. $\endgroup$
    – Adam
    Mar 19, 2020 at 18:20
  • 35
    $\begingroup$ I can see a few differences in the second picture. $\endgroup$ Mar 19, 2020 at 22:52
  • 7
    $\begingroup$ Just checked my Kindle edition with Amazon's online reader and it does indeed have the two photos switched around on page vi. Good catch. $\endgroup$
    – throx
    Mar 20, 2020 at 3:47
  • 11
    $\begingroup$ @throx If you report that to Amazon, they'll contact the author/uploader and "suggest" they correct the edit and reupload (which will result in your downloaded copy being corrected next time your device connects). $\endgroup$
    – Zeiss Ikon
    Mar 20, 2020 at 11:53
  • 4
    $\begingroup$ @Brian - the tree has moved from centre-right to the far left! $\endgroup$ Mar 20, 2020 at 13:12

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