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Deutsche IFLMAUS ?

This is strongly interesting - take a look at this schema a Spanish 1kg incendiary bomb from the early 1920s "a copy of a German early ww1 Carbonit 1kg incendiary originally known as Ifl-Mäuse or Ifl-Bomben" still in use during the early phases of the Spanish civil war
EISA B1 for 1kg incendiary Screenshot 2023-04-17 103823.jpg
and photo of the fuze
EISA B-1 espoleta_vista_1.jpgEISA B-1 espoleta_vista_2.jpg
The drawing and photos come from the excellent site ammonio.es (sadly no longer updated).

PS. Thanks a lot for the link to the archive. There are incredible documents available there.
 
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the german FLIEGERMAUS
 

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Ifl is short for Infanterieflieger however, since 1916 the use appear to have been to designate Fliegermaus the frag version and Iflmaus the incendiary version.

The color drawing on the left refers to the frag version, the 2 others to the incendiary version, though the drawing on the right is highly confusing as it appears to show a "fragmented" envelop and this is not the case on the real original model.

post-34175-1235658827.jpg 01.jpg01.jpg Screenshot 2023-04-17 214034.jpg
Splitterbombe Carbonit 1kg eraly.jpg

The confusion comes from the existence of a later version uniting characteristics of both bombs, and also called the Carbonit 1kg Splitterbombe:
Splitterbombe Carbonit 1kg.jpg

the incendiary version BTW seems to have been released by one of the earliest model of automated bomb rack, the bombs being released by gearing an horizontal hand crank
 
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Are you sure these were incendiary bomblets ?
We found examples filled explosive with very thick walls for frag.
 
Yes, as I wrote in the former post the 1kg Splitter bomb of 1917 looks almost identical to the incendiary Iflmaus of 1916, but for the thick reinforced splitter wall instead of the thin smooth walls thence the confusion.
BTW this raises the obvious question whether these bomblets were not in fact slightly modified air-dropped versions of hand or rifle grenades.

The document on the bomb rack deals only with incendiary bombs - it includes also photographs of the bomb rack for the 1kg elektron bomb and developments models of this eletkron bomb that apparently served as a basis for the German developments of these bombs in the late 30s. Sadly there is no text accompanying these photographs, just titles.
BTW the photograph show a added "ballistic" nose cone for these bombs, a device similar to the one used on the PuW 10kg incendiary (candles version) that apparently was soon discarded as un-needed, )
Screenshot 2023-04-19 130927.jpgScreenshot 2023-04-19 130959.jpgScreenshot 2023-04-19 131013.jpg

The added "ballistic" nose cone of the PuW 10kg incendiary is also shown in the document (the color drawing comes from D emisnest)
Screenshot 2023-04-19 131736.jpgScreenshot 2023-04-19 131849.jpg

An a parte to these posts: It seems that the Spanish EISA ("Experiencias Industriales S.A.") may have been in fact originally the production branch of a German company, as it appears from the letters of the German military attache in Madrid, Colonel Max Bauer in the 1920s that the Engineering Development Branch of this company sat...in Berlin. The chemical bombs produced by EISA were in fact designed by Max Bauer himself who was a skilled expert in chemical warfare.
A similar way of circumventing the limitations imposed by the Versailles treaty was taken by Goertz, continuing their development of PuW bombs from their seat in Berlin and testing them through an agreement with the Swedish Airforce. Not surprisingly EISA produced also the fuzes for the PuW bombs used by the Spanish Air Force and apparently also these bombs (there is photo evidence for the 50kg PuW being produced by EISA, as well as the 20kg PuW incendiary while the 20kg chemical PuW being developed by EISA in the 1920s). EISA had previously acquired from Carbonit AG the licenses for the Carbonit bombs used in the Rif conflict.
 
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