For some years the use of the slide rule as a check in trigonometry has been allowed in the Regents' Examinations of New York State provided that all the computation work appears on the answer paper. The State Education Department insists that the students of trigonometry be trained in the use of tables of natural and logarithmic functions. This training is tested by the requirement that all computation work appear on the answer paper. Having tested this part of the work, the Department encourages the student to check his work as any engineer would do-by the slide rule. The procedure is:(1) Solve the triangle by logarithms.(2) Check to 3 significant figures by the slide rule.(3) If time allows, check to 5 significant figures by the usual logarithmic check or the check of natural functions.