Definition of freethinker. : a person who thinks freely or independently : one who forms opinions on the basis of reason independently of authority; especially : one who rejects or is skeptical of religious dogma.
Even though most German speakers may understand what you mean when you say beamer instead of projector, native English speakers will typically be completely lost. * Evidence for the use of the word beamer for BMW cars and motorbikes can be found in the Oxford English Dictionary, see here. An alternative spelling is beemer. Moreover, as explained here, BMW enthusiasts use beamer/beemer for cars and beamer for motorbikes. (Thanks to Eric for the link.)
A beam compass is an instrument with a wooden or brass beam and sliding sockets, or cursors, for drawing and dividing circles larger than those made by a regular pair of compasses. Scribe-compasses is an instrument used by carpenters and other tradesmen. Some compasses can be used to scribe circles, bisect angles and in this case to trace a line.