PhiScale Tephra Bench

Education · Volcanology lab workbench

PhiScale Tephra Bench

Build a real sieve stack, weigh each fraction, and watch Folk & Ward curves, sorting bands, and teachable deposit textures appear—offline, on iPhone, before the lab period ends.

Explore the bench Lab support
App sieve stack and mass entry screen
100%On-device · offline lab ready
4Folk & Ward stats live
3-waySample curve overlay
PDF+CSVWorksheet export locally

Illustrative marketing figures; not App Store metrics.

Asymmetric lab modules

One polished workbench instead of spreadsheet formulas, paper cumulative plots, and scattered phi-scale handouts.

Seeded sieve stacks

Assemble phi- and mm-labeled meshes from a seeded ASTM-style library or drop in ready lab-kit templates, then log retained mass per fraction with live mass-balance and percent checks.

mesh library · pan fraction

Folk & Ward on every keystroke

Graphic mean, sorting, skewness, and kurtosis recompute on-device as masses change, with plain-language bands from very well sorted to extremely poorly sorted—built for teaching, not forecasting.

graphic stats

Histogram + cumulative canvas

Swift Charts frequency and probability curves with phi markers, D16/D50/D84 callouts, and toggles between weight-percent and cumulative views for report-ready figures.

Compare, clone, drill

Overlay three samples with delta-sorting callouts, browse seeded classic tephra suites and clone them into your bench, then run timed phi↔mm and interpretation drills with explanations.

Glossary, widget, lab tour

Illustrated phi and pyroclast glossary with Dynamic Type, home-screen phi↔mm or last-sample widget, App Intent blank-sample creation, and a first-launch tour for quiet lab starts.

On-device lab worksheet export

Preview multi-page PDFs—stack table, chart, stats block, educational interpretation, signature line—plus optional fraction CSV, all generated locally for hand-in or TA review.

zero network · zero accounts
Worksheet export preview

Bench in frames

From mesh composition to curve overlays—built for undergrad volcanology, sedimentology TAs, and museum education desks.

Frequency and cumulative charts
Curves
Sample comparison overlay
Overlay
Reference suite browser
References
Stats and texture guidance
Stats
Sieve stack builder
Stack

Why the bench exists

About

PhiScale Tephra Bench replaces the usual tangle of spreadsheet formulas, paper cumulative plots, and photocopied phi handouts with one polished lab workbench for undergrad volcanology and sedimentology.

Compose ASTM-style mesh stacks from a seeded library or lab-kit templates, enter retained masses (plus pan), and get live mass-balance checks, graphic mean/sorting/skewness/kurtosis, interactive frequency and cumulative charts, and classroom-only texture guidance such as fallout-like or remobilized assemblages.

Save named samples, overlay up to three for viva discussion, clone classic reference tephra profiles, drill phi↔mm and sorting recognition, and export a full PDF worksheet plus CSV—zero network, zero accounts, zero location services.

  1. 1Compose the stackPick meshes from the seeded library or a lab-kit template.
  2. 2Weigh fractionsEnter retained mass per sieve and pan; mass balance stays live.
  3. 3Read the curvesFolk & Ward bands and deposit-texture cues appear on-device.
  4. 4Export the worksheetPDF + optional CSV for hand-in—still fully offline.