Yantras or Mechanical Contrivances in Ancient India c2.163

c2.163

The machines are then divided into two classes, *Svayam-vāhaka*, automatic and *Sakrit-prerya*, requiring occasional propelling; most machines combine these two features (13). Another classification is: the concealed, *Antarita* or *Alakshya*, *i.e.*, the principle of its action and its motor-mechanism are hidden