The light was "eclipsed" (darkened) every 17 seconds by lowering a metal cylinder around the burner for 3 seconds, thus giving rise to the term "occulting type".
Cahaya itu "hilang" (gelap) setiap 17 detik dengan cara menurunkan silinder logam di sekitar pembakar selama 3 detik, sehingga menimbulkan istilah "tipe gaib".