  We present 248 speckle observations of 43 binary and 19 trinary star systems
chosen to make progress in two main areas of investigation: the fundamental
properties of metal poor stars and star formation mechanisms. The observations
were taken at the Gemini North and South telescopes during the period 2015 July
to 2018 April, mainly with the Differential Speckle Survey Instrument (DSSI),
but also with a few early results from the new 'Alopeke speckle camera at
Gemini North. We find that the astrometry and photometry of these observations
as a whole are consistent with previous work at Gemini. We present five new
visual orbits for systems important in understanding metal-poor stars, three of
which have orbital periods of less than 4 years, and we indicate the degree to
which these and future observations can impact our knowledge of stellar
properties and star formation. In particular, we find a decrease in mass at
fixed spectral type for metal poor stars versus their solar-metallicity
analogues that is consistent with predictions that are made from current
stellar models.
