What are some historical optical instruments where the concept of the principal axis was implicitly or explicitly used?

Feb 28, 2018 ... One way to say it: you do not need to apply any external torque to keep an object rotating about a principal axis. To create a datum axis along a principal axis: From the main menu bar, select Tools Datum. The Create Datum dialog box appears. Abstract. Principal axis factoring (PAF) and maximum likelihood factor analysis (MLFA) are two of the most popular estimation methods in exploratory factor ... Jan 2, 2010 ... ULS is the same as the MINRES method described in Harman's factor analysis book. The equivalence is pointed out e.g. by Joreskog (2007) in the ... Aligning a molecule to its principal axes. Load the molecule into vmd, and run the following commands to align the first, second, and third principal axes to ... A formula is derived for determining the orientation of the arc linking on an auxiliary sphere the axis of inertia and the principal axis of inertia of the ... 97 THE SUPPORTING AND COUNTERWEIGHTING OF THE PRINCIPAL AXES OF LARGE TELESCOPES.* By C. D. PERRINE. In a telescope whose moving parts weigh several tons it ... Principal Axis Factoring (PAF) is a statistical technique used primarily in the field of factor analysis. It aims to identify the underlying relationships ... Dec 26, 2016 ... I have 298 cases and I did a Principal axis factoring analysis and a max likelihood analysis but I'm not sure which one would be best. Feb 22, 2023 ... We introduce a graph construction scheme that constructs the adjacency matrix A using unsupervised and supervised information.