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Tree measurements are collected using such forestry tools as a low-tech Biltmore stick, a clinometer or, most accurate of all, a laser hypsometer.

He used a clinometer, a device that allowed him to determine the height by triangulating, using the tree, his own position and the angle of the distance between them.

Between the col and the summit we met some very steep snow slopes on the South side: we carried no clinometer and I shall not venture to estimate their angles of inclination.

Records are sketchy on exactly when the height-measuring clinometer was invented.

"Are you certain," I repeated, "that you've only got your own telescope and sight clinometer?"