A seismoscope is a qualitative indicator of seismic activity -- as opposed to seismographs which show quantitative data, typically through line graphs. The oldest known seismoscope is Chinese and dates backs from 132. It was a large bronze device that dropped a ball into a bronze container (one of the eight frogs on the image above) every time an earthquake was detected, thus producing a loud sound. The direction of the earthquake could then be examined by looking at the container in which the ball was dropped. In AD 132, Zhang Heng of China's Han dynasty invented the first seismoscope (by the definition above), which was called Houfeng Didong Yi (translated as, "instrument for measuring the seasonal winds and the movements of the Earth"). The description we have, from the History of the Later Han Dynasty, says that it was a large bronze vessel, about 2 meters in diameter; at eight points around the top were dragon's heads holding bronze balls. When there was an earthquake, one of the mouths would open and drop its ball into a bronze toad at the base, making a sound and supposedly showing the direction of the earthquake. On at least one occasion, probably at the time of a large earthquake in Gansu in AD 143, the seismoscope indicated an earthquake even though one was not felt. The available text says that inside the vessel was a central column that could move along eight tracks; this is thought to refer to a pendulum, though it is not known exactly how this was linked to a mechanism that would open only one dragon's mouth. The first ever earthquake recorded by this seismograph was supposedly somewhere in the east. Days later, a rider from the east reported this earthquake. Sources: Text from Wikipedia. Pictures from sciencemuseum.org.uk Related: Also see our entry 1992 – Durrell Bishop's Marble Answering Machine.

The mercury thermometer was invented by Dutch physicist Daniel Gabriel Fahrenheit in 1714. It consists of a narrow glass tube with a bulb at the bottom, containing mercury. The volume of mercury changes with temperature; mercury is driven out of the bulb and up the tube as the temperature rises. Sources: Wikipedia article on Mercury-in-glass thermometer Image Credit: Donar Reiskoffer, Wikimedia Commons

This device was the location indicator for Russian spacecrafts from the world's first manned spaceflight by Yuri Gagarin, 12 April 1961, until 2002. It contains a mechanical computer and a physical globe which rotated to always display the point on earth exactly underneath the spacecraft, or, alternatively, the point where the spacecraft would land if the re-entry rockets where fired at that exact moment. The numbered bullets on the globe in the third picture indicate radio communication centers linked to mission control in Moscow. Source: Wikipedia.