ts above de- the movable arm. The small pulley below is connected times greater than and equal in number to the longi- scribed are produced on a scale sufficiently extended to tudinal divisions of the parallelogram. From a point at with the small pulley above by a crossed belt, and the be seen by a… … the four revolutions in one Fig. 6.-METH0DS OF LAYING OUT ANORTHOSCOPE DISKS.-Fig. 7. shown in Fig. 11. These direction of the disk carry- forms may be greatly mod- ing the design and the single revolution of the ified by moving the slotted disk in the lantern across circle of the set thus drawn,…
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