David Brunt and the Study of Weather Cycles

Compiled from the Foundation for the Study of Cycles archive (Cycles — A Monthly Report / Cycle Magazine, vols. 1950–1955)

Who He Was

Sir David Brunt appears in these pages as "an Englishman" — the archive gives no further biographical detail beyond his nationality and his output, which tells you something about how the Foundation typically treated its cited authorities: they were interested in the data, not the person. He is referenced repeatedly as one of the primary authorities on cyclic behavior in European weather, cited in the same breath as Sir William Beveridge, H. H. Clayton, and E. Brückner — the core figures of early-20th-century climatic periodicity research.

The Core Work: The 1927 Study

The archive's central reference point is:

"David Brunt, an Englishman, published in 1927 an exhaustive study tracing some 34 different weather rhythms, with durations of from less than two years up."

This 1927 study is treated as one of the foundational surveys of the field — a systematic hunt through European weather records for recurring periodicities, using harmonic analysis of rainfall, temperature, and atmospheric pressure across twelve European cities with records extending back at least a century.

A more detailed passage in the 1953 volume elaborates:

"The right-hand side of Figure 57 compares Beveridge's cycles with those found by Brunt in an elaborate harmonic analysis of rainfall, temperature, and atmospheric pressure in twelve European cities where records for at least a century are available... In addition to the 28 cycles shown here, Brunt describes 16 more with a length of less than 2 years."

So Brunt's total catalogue of identified weather rhythms ran to roughly 44+ distinct periodicities once the sub-2-year cycles are included — an extraordinarily granular harmonic decomposition for the era.

Specific Cycle Lengths Attributed to Brunt

The archive credits Brunt with isolating several specific periodicities that recur throughout the Foundation's cross-comparisons with other researchers' work:

• ~22.4 years — a rhythm in European weather, later cross-referenced by Dewey's colleagues against the ~22.3-year sunspot polarity-reversal cycle found by C. N. Anderson

• 7.50 years — a climatic rhythm, closely bracketed by H. P. Gillette's 7.47-year drought-based figure and Beveridge's 7.42-year figure. The Foundation treated this convergence as significant enough to flag repeatedly

• 8.16 years — found in Brunt's century-long study of European weather, sitting alongside a cluster of independently-derived "~8-year" cycles from Dinsmore Alter (8.1 yrs, sunspots), H. H. Clayton (8.1 yrs), Beveridge (8.05 yrs, wheat prices), and A. E. Douglass (8.2 yrs, tree rings)

How the Foundation Used Brunt's Work

Edward Dewey and his colleagues treated Brunt primarily as a cross-validation source — a way of checking whether a cycle length found in one dataset (say, wheat prices, or sunspots, or animal populations) also showed up independently in Brunt's European weather record. The logic, explicit throughout the archive, was that a cycle appearing across unrelated phenomena was much harder to dismiss as a statistical artifact than one found in a single series.

The Foundation's summary comparison (Figure 57, December 1953 report) explicitly overlaid Beveridge's wheat-price cycles against Brunt's weather cycles and found points of convergence near 3½, 5, 8, 9½, and 35 years — treating agreement between an economic historian (Beveridge) and a meteorologist (Brunt) as meaningful corroboration of an underlying cyclic force.

Brunt in Context: The Wider Circle

Brunt doesn't stand alone in this literature. The names that recur alongside him — and that may be worth their own entries for your forum — include:

• Sir William Beveridge — wheat price and rainfall cycles in Western Europe (1500–1869)

• E. Brückner — the 35-year "Brückner cycle" in European weather (1891), tracing back to an observation by Sir Francis Bacon

• H. H. Clayton — barometric pressure cycles from Siberia to Calcutta

• H. P. Gillette — drought-based climatic rhythms

• A. E. Douglass — tree-ring dendrochronology and cyclic analysis

• C. E. P. Brooks — Nile flood cycles

• C. N. Anderson — sunspot cycle analysis (Bell System Technical Journal)

Given your interest in surfacing lesser-known figures for the forum, several of these — particularly Brückner and Gillette — appear to have done foundational work that's largely forgotten today, much like Brunt himself.

Note on Sourcing

All citations above are drawn directly from the Foundation for the Study of Cycles' own publications (1952–1953 volumes currently in the project). The Foundation's own footnoted reference for Brunt's original work does not give a full bibliographic citation in the passages captured here — if you want the exact title of the 1927 study, that would need tracking down externally (likely Periodicities in European Weather, Royal Society, 1927 — worth verifying independently before publishing).