The Shulbasutras of Baudhayana, Apastamba, Katyayana and Manava: With Text, English Translation and Commentary c8.t28.19
The Śulbasūtras of Baudhāyana, Āpastamba, Kātyāyana and Mānava: With Text, English Translation and Commentary c8.t28.19
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c8.t28.19
B₄ — the brick, suitable for use in either wing (*pakṣeṣṭakā*), is a parallelogram of sides ¼ and 1/7 pu. The shape is so given that one diagonal *ac* is longer than the other *bd*, whose dimensions are given by Sundararāja as 40 *aṅg.* 12 *ti* and 27 *aṅg.* 20 *ti*. The purpose is to make it fit in the wing, so that the inclinations are similar to those of the wing at either side of the bending. Clearly *de* is 1/7 of 108¾ ang. or 15 *aṅg.* 18 3/14 ti (Sundararāja gives this value as 15 *aṅg.* 18 *ti*). The shapes of B₄, B₅ and B₆ are further explained in 19.8.