10. Diwanu’s-Sirr This Board is mentioned in two places by al- Jahshiyari, that is, under al-Mansur and under Harun Rashid’; in both the place it is reported to be under the same officer who was in charge of Diwanu’r-Rasa’il. Possibly it was a section or department of Diwanu’r Rasa’il.
11. Diwanu-1-Ard This Board is also mentioned by al-Jahshiyari. It concerned itself with the inspection of military equipments, etc. The arsenals were under a special officer called the Mushrifu’s Sana’ati bi’IMakhzan. Whether this Board was a part of Diwanu’I-Jund or an independent one is not clear.
