In 1869, they introduced a new " illumination apparatus " that was designed to improve the performance of microscope illumination.
(they; introduced; a new " illumination apparatus " that was designed to improve the performance of microscope illumination; T:In 1869) (a new " illumination apparatus; was designed; to improve the performance of microscope illumination) (a new " illumination apparatus; to improve; the performance of microscope illumination)
they a new " illumination apparatus a new " illumination apparatus
introduced was designed to improve
a new " illumination apparatus " that was designed to improve the performance of microscope illumination T:In 1869
to improve the performance of microscope illumination
the performance of microscope illumination