this instrument, both based upon the development of and probably well lantern objective of low power is used and the slots the original picture in a subdivided rectangle. It is known to many, it is are sharply focused on the large disk. The disks are obvious that if a subdivided square can be… … In the sleeve in the standard is journaled a shaft trical line, a distance equal to the versed sine of this are. From this having at one end a crank, and a pulley of the same center describe circles tangent to the sizeas that above it at the upper end of the standard, horizontal lines of the…
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