We saw that the altazimuth employed at Upsala had no lenses.
"Scientific American Supplement, No. 611, September 17, 1887" by Various
The altazimuth can thus determine the altitude and azimuth of objects, hence the name.
"The New Gresham Encyclopedia. Vol. 1 Part 1" by Various
The antennas are mounted on a rigid tracking platform supported by an altazimuth mount that is fully steerable to elevations > 42◦ .
The Cosmic Background Imager