Shapes of चषालः caṣāla and vajra 'thunderbolt weapon' are octagonal as stipulated in SBr vedic text

Mirror: http://tinyurl.com/zd8wmeq

See the four yupa on Jasper cylinder seal. The top चषालः caṣāla is shaped like a vajra :)-- hour-glass octagonal shape like the vajra held by vajrapani. 

I suggest that the octagonal shape is linked to the metal sharp-edged weapon which is sought to be produced in the smelting operations. The octagonal shape is  as stipulated in SBr vedic text.

See: http://bharatkalyan97.blogspot.in/2016/01/archaeological-evidence-for-vajrabaho.html

Relief narrating the visit of Buddha and Vajrapani to an ascetic. From Hoti Mardan Guide Mess, Peshawar, n. 2066, 2nd-3^rd cent. CE c. (after Lyons I & H.Ingholt,1957, Gandharan Art in Pakistan, New York, pl.54)

Vajra with octagonal bases. Relief fragment. Dipamkara Jataka with Buddha & Vajrapani. Butkara, Swat, 1st-2^nd cent. CE c., Museo Nazionale d'Arte Orientale 'Giuseppe Tucci', Roma, dep. IsIAO, Inv. MNAOR 1127, MAI B 65;79 (after Bussagli, M.,1984, L'Arte del Gandhara, Torino, p.146) Note: Vajrapani holds a Vajra of eight-angles.

Vajra with octagonal bases. Vajrapani. Tepe Shotor, Afghanistan, 4^th cent. CE (after Santoro, A., 1991, Note di iconografia gandharica, v. Appunti and Vajrapani Eracle, Rivista degli Studi Orientali, LXV, 3-4, pp. 269-309 fig. 5)

Vajra with octagonal bases. Detail of the stele with Buddha, Vajrapani and Padmapani, Ahichchatra, Uttar Pradesh, years 32 of Kanishka era. Delhi, National Museum, Acc. No. L. 5525

Vajra with octagonal bases. Indra. Visvantara Jataka. Great Stupa. Northern Torana, Sanchi, 1^st half of 1^st cent. CE (After Marshall, J. & A. Foucher, 1940, The monuments of Sanchi, Calcutta, vol. .II, pl. 29)

The heroes carrying the standard are signified by six curls on hair.

baTa 'six' rebus: bhaTa 'furnace' meDh 'curl' rebus: meD 'iron (metal)'.

Cylinder seal with kneeling nude heroes, ca. 2220–2159 b.c.; Akkadian  Mesopotamia Red jasper H. 1 1/8 in. (2.8 cm), Diam. 5/8 in. (1.6 cm)  Metropolitan Museum of Art - USA

Four flag-posts(reeds) with rings on top held by the kneeling persons define the four components of the iron smithy/forge.  

http://bharatkalyan97.blogspot.in/2016/01/yupa-as-flagpost-indus-script-evidences.html
S. Kalyanaraman
Sarasvati Research Center
January 9,2016