Hand (unit) inches for the handsbreadth; Mortimer gives the same, three inches for the Hand's-breadth, and four for the "Handful, or simply, Hand", but adds "The hand among horse-dealers, &c. is four-fingers' breadth, being the fist clenched, whereby the height of a horse is measured", thus equating "hand" with both the palm and the fist. Similarly, Wright's 1831 translation of Buffon mentions "A hand breadth (palmus), the breadth of the four fingers of the hand, or three inches", but the "Encyclopædia Perthensis" of 1816 gives under Palm (4): "A hand, or measure of lengths comprising three inches". Today the hand is used
Source measure unit cells, or other energy generating devices. SMUs also offer greater speed and precision and typically support wider operating ranges. The built-in sourcing capabilities of an SMU work with the instrument’s measurement capabilities to reduce measurement uncertainty and support low current and more flexible resistance measurements. In voltage measurements system-level leakage can be suppressed more easily than with separate instruments. In current measurements, the SMU’s design reduces voltage burden. For resistance measurements, SMUs provide programmable source values, useful for protecting the device being tested. Notable features of SMUs include the following: Source measure unit The Source measure unit (SMU) is a