James Clerk Maxwell Telescope Project - Hilo, Hawaii With a diameter of 15m the James Clerk Maxwell Telescope (JCMT) is the largest astronomical telescope in the world designed specifically to operate in the submillimeter wavelength region of the spectrum. The JCMT is used to study our Solar System, interstellar dust and gas, and distant galaxies. It is situated close to the summit of Mauna Kea, Hawaii, at an altitude of 4092m. See More.... Engineering and Computer Solutions was contracted to measure and assist in the setup and installation of an optical instrument to be installed and tested on the telescope.