Removing the crust

THANKS to the initiative of POWER JETS LIMITED, and the enthusiastic co‐operation of members of the firm's staff, we publish in this issue the first part of a full description of the German Jumo 004 jet engine—which is, incidentally, the first axial‐compressor engine of this type of which details have been published. We are most grateful to the firm for making this information, which is of outstanding interest, available to our readers and also to those individuals in its employ who have gone to so much trouble to embody in the article the contents of a number of individual reports prepared from time to time on various parts of the engine as they became open to examination.