Definition of "tryer"

[…] I had once brought me a certain Earth, by a Gentleman that digg'd it up in this, or ſome neighboring Country, vvhich, though it ſeem'd but a Mineral Earth, did really afford, to a very expert tryer of Metals of my acquaintance, a not deſpicable proportion of Gold.

1663, Robert Boyle, “Essay V. Proposing Some Particulars wherein Natural Philosophy may be Useful to the Therapeutical Part of Physick.”, in Some Considerations Touching the Vsefulnesse of Experimental Naturall Philosophy, […], Oxford, Oxfordshire: […] Hen[ry] Hall printer to the University, for Ric[hard] Davis, part II, section I (Of It’s Usefulness to Physick), chapter III, page 132

The Spartans did not allow the father to dispose of his child as he thought fit, for he was obliged to take it to the tryers, who, if they found it puny and ill-shaped, ordered it to be carried to a sort of chasm under Taygetus […]

1866, Boston Medical and Surgical Journal, volumes 74-75, page 310