| http://www.w3.org/ns/prov#value | - This invention relates to an arrangement for oscillating an element, such as a reflecting surface, back and forth in an arcuate path at a substantimly constant angular velocity through a major arc segment. 15 Claims, 13 Drawing Figures PATENTEI'IJUHQO 1212 3.671 .766 saw 105} 5 Displacement a Time Fig. 5. 86 Spencer D. Howe, lNVENTOR. ATTORNEY. PATENTEDJUMO I972 3. 671 .766 ' sum 5 or 5 IIIIII[E\
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