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* '''Horizontal Motion Isolation:'''
The beam-columns have horizontal stiffness Ks with the weight load applied laterally. Due to this the lateral bending stiffness is reduced by the "beam-column" effect. This behavior is equivalent to a horizontal spring combined with an NSI so that the horizontal stiffness is K=Ks-Kn, and Kn is the magnitude of the beam-column effect.
[[File:NSI2.png|frame|left|Horizontal motion isolation. Image reproduced from [https://commons.wikimedia.org/wiki/File:Vibrations_damping.svg here]]][[File:NSI5NSI6.gifjpg|frame|center|Image reproduced form [Six DOF Single Isolator. Attribution: By Sdv1120 - Own work, Public Domain, https://commons.wikimedia.org/wikiw/File:Vibrations_dampingindex.svg here]php?curid=10530707]]
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