Leon Berger. Noted improvements to the guillotine machine were made in 1870 by the assistant executioner and carpenter Leon Berger. Berger added a spring system, which stopped the mouton at the bottom of the groves. He added a lock/blocking device at the lunette and a new release mechanism for the blade.
An observatory is a place for observing, or studying, natural objects and events on Earth or in space. An astronomical observatory is a place to observe space. Scientists use this type of observatory to gather information about stars, planets, comets, and other things outside Earthâs atmosphere.
Observation is what one sees, inference is an assumption of what one has seen. Observation can be said to be a factual description, and inference is an explanation to the collected data. It's not a guess. If an observation can be termed as a close watch of the world around you through the senses, then inference can be termed as an interpretation of facts that has been observed. Teachers can start out providing simple observations: 1  Observation: The grass on the playground is wet.