New or refined visual orbital elements are presented for four double stars
(HR 266 AP, 88 Tau AP = CHARA 18, eta Ori AB = McA18, ADS 16904 AP = CHARA
149) that are members of multiple systems. Relative photometry and position
al speckle measurements with the 6-m telescope and published radial-velocit
y data for the stars are used. Photometric data and parallaxes from the Hip
parcos catalogs are also taken into account. New physical models are propos
ed for multiple systems.