- The linear invariant a s is such that, when equated to zero, it determines the lines ax as
**harmonically**conjugate to the lines xx; or, in other words, it is the condition that may denote lines at right angles. - The whole disposition of pillars, posts, brackets and rafters is
**harmonically**arranged according to some measure of the standard of length. - Turner has analysed
**harmonically**the light-curves of a number of long-period variables, and has shown that when they are arranged in a natural series the sun takes its place in the series near, but not actually at, one end.

- harmonically
- harmonically-bound
- harmonicas
- harmonicist

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