Combination of `V' signs and linear strokes were used to indicate volumes
The Indus civilisation had a volumetric system with inscriptions on ceramic vessels (glazed pots from Harappa) indicating that the sign ‘V’ stood for a measure, a long linear stroke equalled 10, two long strokes stood for 20 and a short stroke represented one, according to Bryan Wells, who has been researching the Indus script for more than 20 years.
These markings on the pots are identical to those found on the incised tablets and bas-relief tablets also found in Harappa, said Dr. Wells, who earned his Ph.D. from Harvard University for his thesis on “The Epigraphic Approaches to Indus Writing.” It is to be published as a book in 2010.
Besides, a ceramic vessel from Mohenjo-Daro, which had fragments of blue-coloured bangles inside, had one long stroke and seven short strokes inscribed on it. When these broken pieces were reconstructed with a computer, they turned out to be 17 bangles. This again established that one long stroke equalled 10 and each short stroke one, Dr. Wells said. He described the findings as “an important discovery” and “very interesting.”
Dr. Wells has proposed that “these sign sequences [sign ‘V’ plus numerals] are various values in the Indus volumetric system. The bas-relief tablets might have been used as ration chits or a form of pseudo-money with the repetitive use of ‘V’ paired with ||, |||, |||| relating to various values in the Indus volumetric system. The larger the ceramic vessel, the more strokes it has. This postulation can be tested by detailed measurements of whole ceramic vessels with clear inscriptions.”
For instance, he recently measured the volume of the three pots from Harappa, which are now with the Archaeological Survey of India (ASI) at Purana Quila in New Delhi. While the smallest of them had three long strokes and a ‘V’ sign, the bigger one had six long strokes and a ‘V’ sign and the biggest seven long strokes and a scale inscribed below it. When he measured their volumes, Dr. Wells found that the pot with three long strokes had an estimated volume of 27.30 litres, the vessel with six long strokes 55.56 litres and the one with seven 65.89 litres. Thus, the calculated value of one long stroke was 9.24 or approximately 10 litres.
Dr. Wells (58), who is now a Senior Researcher in the Institute of Mathematical Sciences, Taramani here, has also focussed on creating an adequate sign list and corpus for the Indus script and the structural analysis of the Indus texts.
He said he first saw the pictures of these pots with markings in the “Corpus of Indus Seals and Inscriptions,” edited by Asko Parpola and his colleagues. When he learnt that the pots were with the ASI at Purana Quila, Dr. Wells travelled there to measure their volumes.
It was Michael Jansen, another researcher on Indus civilisation, who discovered the pot with broken bangles at Mohenjo-Daro in 1987. What intrigued Dr. Wells was the text of one long stroke and seven short strokes inscribed on it. When he reconstructed these broken pieces, using their internal circumferences, with a computer, he found that 17 bangles must have remained intact inside. Besides, the rake sign in the Indus script had a value of hundred and the double rake sign, 200. “This is completely regular” and “not a result of coincidence,” he said. When the ‘V’ sign with linear strokes that occurred on the Harappan tablets were found repeated on a number of ceramic vessels, “it gave me the idea that the ‘V’ sign is probably a measure,” Dr. Wells explained.
It was possible that wages were paid in grain (from these vessels) dispersed from a centralised storage facility, or in the case of incised tablets, material for construction projects and other short-term projects was distributed. He asserted that “there is archaeological evidence bearing on this issue in the form of standardised ceramics with texts describing their contents.”
“Fish” for weights
Dr. Wells agreed with another Indus scholar Steve Bonta’s (Pennsylvania State University) theory that the “fish” sign in the script stood for weights. According to Dr. Bonta, the fish sign occurred frequently with numbers in the script and in clusters too. He later found that the Akkadian Sargonic texts referred to the weight systems of Dilmun (Bahrain) as “minus.” The system of weights from Dilmun was exactly the same as that of the Indus system. Dr. Bonta, who speaks Tamil, realised that “min” in Tamil meant fish. “So our theory is that the term “minus” is derived from the Indus and that the fish are weights,” Dr. Wells said. There were fish signs with one long stroke, two long strokes, a single rake or a double rake. “So the sign graph is doubling and the value is doubling. I think this is too much of a coincidence. But I am aware that a lot of people will disagree with me on the fish sign,” he added.