वास्तु मण्डन (मण्डन सूत्रधार - गृह, राजप्रासाद, दुर्ग एवं नगर-वास्तु सटीक)

Ch. III – Durgādilakṣaṇam 95 74. With ignition at the back, the ball goes far and it destroys city gates houses, villages and pleasure gardens. 75. These fire arms create panic among the enemy's soldiers and these mostly bring victory for the Kings in many ways. 76-77. The weapon is to be worshipped with cooked rice, wine and meat. That part of the fire tube which is covered with skin, will measure eight Aṅgulas (Dvimuṣṭikā). The length will be for consideration of utility and the breadth will be 1/4th of the 1/2 of the height. That tube is to be filled up with slightly moistened minerals. 78. The minerals have to be repeatedly ground and the front part measuring one Aṅgula will be filled up and the residual ground minerals are to be poured into the small hole, measuring one Yava, at the back for ignition. 79. One should measure one, two, three Aṅgulas of the Sūrya (Arka (tree), the front part of the Siṁha (Olibanum tree), Rubuka (Castor oil) and burnt coal dust. 80. In addition to the minerals earlier prescribed for fire arms, five, six, seven or eight parts of bitumen are to be used. 81. One part of the sulphur (Gandhaka) is to be taken in proportion of half, half and a pair of two. This is the procedure of taking the minerals and there are innumerable other varieties. 82. After ignition, different directions of fire are marked. The balls are to be made with bitumen, with twice the amount of sulphur mixed with water. 83. From the mouth of the tube, the fire emits like stars and it will burn the city of the enemies. Here ends the description of the fire arms.