| http://www.w3.org/ns/prov#value | - Such a trajectory will cause all of the ions of this specitic mass, that is, .all of the ions traveling ina cycl'oid of given pitch, to come to a focus in a point in sp-ace which in this instance is a point on the `focal plane at which the resolving yslit 21 is located, i. e. at a point exactly 360 of trajectory beyond the point :of origin.
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