Video 1. Michelson Interferometer by Amrita Vlab (2013) Source. Shows the optical controls and alignment in more detail.
Video 2. Michelson Interferometer by TSG Physics (2012) Source. TSG PHysiQuantum electrodynamics bibliographycs is the channel from the MIT Department of Physics Technical Services Group. In the video they produce a very clear round interference pattern.
This paper is in the public domain and people have uploaded it e.g. to glorious Wikisource: including its amazing illustrations.
Figure 1. Fig 3 from On the Relative Motion of the Earth and the Luminiferous Ether. Source. Amazing 3D technical drawing from the 19th century!!!