  We describe two related experiments that measured the anisotropy in the
cosmic microwave background (CMB). QMAP was a balloon-borne telescope that flew
twice in 1996, collecting data on degree angular scales with an array of six
high electron mobility transistor-based amplifiers (HEMTs). QMAP was the first
experiment to use an interlocking scan strategy to directly produce high
signal-to-noise CMB maps. The QMAP gondola was then refit for ground based work
as the MAT/TOCO experiment. Observations were made from 5200 m on Cerro Toco in
Northern Chile in 1997 and 1998 using time-domain beam synthesis. MAT/TOCO was
the first experiment to see both the rise and fall of the CMB angular spectrum,
thereby localizing the position of the first peak to l_{peak}=216 +/- 14. In
addition to describing the instruments, we discuss the data selection methods,
checks for systematic errors, and we compare the MAT/TOCO results to those from
recent experiments. We also correct the data to account for an updated
calibration and a small contribution from foreground emission. We find the
amplitude of the first peak for l between 160 and 240 to be T_{peak}=80.9 +/-
3.4 +/- 5.1 uK, where the first error is statistical and the second is from
calibration.
