[f. as prec. + -ING1.] The action of the vb. CALCULATE; calculation: chiefly attrib., as in calculating-engine, -machine, -machinery, etc.
1710. Brit. Apollo, III. 66. His Trigonometry for the Calculating of Sines, Tangents, &c.
1833. Brewster, Nat. Magic, xi. 292. The greater part of the calculating-machinery is already constructed.
1878. Tait & Stewart, Unseen Univ., ii. § 80. 90. Charles Babbage, the designer of the well-known calculating engine.
