We are not the first is a book written by Andrew Tomas in 1971, This book has information on concepts in Agastya Samhita. For those of you who don’t know what it is, Agastya Samhita is a book by sage Agastya on various scientific topics such as electricity, aerodynamics, chemistry, etc. Andrew in his book mentions that during his stay in India, he came across Agastya Samhita which explains the process of making electrical batteries. He gives a detailed explanation of it in his book. There are numerous interpretations of it around the world, and many people claim to have successfully created the battery following these instructions.
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A well-cleaned copper plate should be placed in an earthenware vessel. It should then be covered first by copper sulfate and then by moist sawdust. Mercury amalgamated zinc plate should then be placed on the top of the sawdust. By their contact, a light known by the twin-names Mitra-Varuna (cathode-anode or electricity) is produced. Water will be split by this current into Pranavayu and Udanavayu The joining together of hundreds such vessels is very active or effective. The translation may or may not be correct, you can refer to original text Agastya Samhita