It appears that the Belgians took the above rule, copied verbatim chapter & verse, directly from the British Rules of 1896, where the sender(mechanic) could upon written request petition the two Companies to use Schultze, EC or another prescribed propellent, but it had to rise to the occasion to prouduce a stress greater than 80% but less than 100% of the Service Load.

Hochachtungsvoll,

Raimey
rse