One of the few museums of its kind in India, the Visvesvaraya Technological Museum has within its portals various scientific disciplines. Exhibits are placed behind glass panels, with buttons which are pressed for the experiments to begin. The Electrotechnic Gallery has various electrotechnic experiments and the history of the development of telephone technology. There is also a wall display of long distance telephone operations along with all its essential components. The Timber, Paper and Metals Gallery has a life size model of a man and woman tending a plant. There is a fascinating wall model of the map of India which is a console with various buttons. Over this are the names of twelve types of trees. Between the name of the tree and the button is a small square glass case. Press a button and the glass lights up with a picture of the specified tree. Corresponding areas where the tree exists light up on the map, indicating its areas of growth. The metal section has replicas of ancient gold coins, the oldest dating to the 4th century AD. At the entrance of the Popular Science Gallery is a model of the constmction of an Egyptian pyramid. There is also a drawing of a body explaining how early measures were based on the proportions of the human body. There are collections of ancient time pieces, oil lamps, sand hour glasses, a sun dial and a model of Delhi's Jantar Mantar. Portraits of famous mathematicians as well as a model of th original Morse code showing of the alphabet and their signs aic display.