Anagrams of: ETROTHS_

• German physicist who was the first to produce electromagnetic waves artificially (1857-1894)

• the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz)

• German physicist who with James Franck proved the existence of the stationary energy states postulated by Bohr (1887-1975)

• spur on or encourage especially by cheers and shouts

• force or impel in an indicated direction

• spur on or encourage especially by cheers and shouts

• force or impel in an indicated direction

• eruptions along a nerve path often accompanied by severe neuralgia

• be silly or tease one another

• obtain through intimidation

• obtain by coercion or intimidation

• get or cause to become in a difficult or laborious manner

• a small notebook for rough notes

• of or relating to the null set (a set with no members)

• a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

• a mathematical element that when added to another number yields the same number

• the point on a scale from which positive or negative numerical quantities can be measured

• the sight setting that will cause a projectile to hit the center of the target with no wind blowing

• indicating the absence of any or all units under consideration

• having no measurable or otherwise determinable value

• indicating an initial point or origin

• adjust (an instrument or device) to zero value

• adjust (as by firing under test conditions) the zero of (a gun)