Equation 6 · Part 2 · The Machine Before Electronics
subscript
subscript
What this part means
The lower label selects a particular version, component, or indexed member of the quantity. For example, x₀ and xₜ can be values at different positions.
Its job in the formula
A subscript distinguishes a version, component, step, or member of a quantity. It does not automatically mean multiplication.
Full expression→subscript→Article meaning
The passage around this formula
Thomson’s machine implements exactly that division. Each of the ten shafts in the 1872 instrument carries an overhead crank with a pulley pivoted on a parallel axis that is adjustable for the range applying to that place — the amplitude — and each crank can be positioned and clamped to correspond to the required tidal epoch — the phase . The shafts are geared so that their periods are proportional to the periods of the tidal constituents — the frequencies [ 3 ] . The summing cord performs the . The pen writes h(t) against a moving paper roll while a single crank drives everything at once.
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.