Ancient Science and Technology in Sri Lanka

Introduction

  • Science defined as the process of understanding & interpreting natural phenomena through experience and validation.
    • Ancient Sri Lankans, though not using modern terminology, identified natural fundamentals and applied them in daily life.
  • Key scientific method highlighted:
    • Observe regularity (e.g.
    • Throwing an object upward → it falls due to gravitation).
    • Formulate principle (gravity, conservation of energy).
    • Verify by experiment.
    • Apply practically → technology (e.g.
    • Transforming electrical to kinetic energy in an electric fan).

Early Stages of Scientific Ideas (Pre-historic & Proto-historic)

  • \approx 28\,000 years BP: production of symmetrical stone tools from alabaster (“ground-glass”).
    • Technique: pressure flaking ("pressure slating") → demands precise force control & understanding of hardness.
  • Black-red ware evidence of advanced pyrotechnology.

Clay Tub Burials (c. 1350\,\text{B.C.})

  • Raw-clay sarcophagi shaped like huge basins/boats.
    • Walls built perpendicular to ground → reduces horizontal pressure; aligns with physics principle that vertical load is neutralised along the normal.
    • Modern masons’ plumb-line (plummet) echoes this practice.
  • Built-in air tube to support combustion while cremating skeletons.
    • Pre-empts modern (18th-century) understanding that \text{O}_2 is essential for burning.

Domestic Architecture (Udaranchamadama House, 1129\,\text{B.C.})

  • Stone-reinforced floor; clay-and-wattle walls; internal partition wall; post-holes for a wooden doorframe.
  • Demonstrates knowledge of foundations, load distribution, room functional zoning.

Pottery Technology

  • Device: “Sakaporuwa” – a manually spun potter’s wheel.
  • Process steps:
    1. Locate suitable clay; soak & season.
    2. Remove coarse particles → decant colloidal clay (similar to modern porcelain slip-casting).
    3. Shape on Sakaporuwa; air-dry.
    4. Firing protocol for black-red ware:
    • Stuff vessel with rice chaff; invert in kiln.
    • Limited oxygen inside → interior vitrifies black; exterior oxidises red.
    1. Post-firing polishing & mineral-pigment decoration (e.g.
    • White slip + orange lines, red-brown hematite polishing stones).
  • Technique disappears after 300\,\text{B.C.}

Maturity of Scientific Usage

5.2.1 Water Management

Mega-Reservoirs (Anuradhapura Era)

  • Multifunction: irrigation, flood control, urban supply.
  • Representative capacities:
    • Kawdulla = 2537\,\text{ha}
    • Minneriya = 2550\,\text{ha}
    • Hurulu = 2125\,\text{ha}
    • Kala Wewa = 2125\,\text{ha}
    • Padaviya = 2357\,\text{ha}

Tank-bund Engineering

  • Sited on natural rock saddles between hills → prevents settlement.
    • Example: Yodha Wewa bund \approx 7\,\text{mi} long, 44\,\text{ft} high.
  • Layered core discovered at Sigiri-Mahawewa excavation:
    1. Compacted clay
    2. Earth fill
    3. Gravel
    4. Fine “kirimeti” clay cap
    • Compaction likely done with elephants (cf.
      Ruwanweli-seya foundation tales).

Erosion Control – Ralapanawa

  • Stone revetment on inner slope dissipates wave energy produced by wind-generated water oscillations.

Sluice (Sorowwa) Technology

  • Stone-lined outlet channel set at designed head to manage hydrostatic pressure.
  • Wessagiriya inscription (King Mahinda IV) mentions “Mohol Naga” – the wooden control shaft/plug.

Sigiriya Hydraulics

  • Spiral gutter system of gentle gradient – maximises laminar flow, allows silt settlement.
  • Stone filters at intervals to desilt during monsoon.
  • Hydro-pneumatic fountains still operate; vertical jet height regulated by orifice diameter \rightarrow P \propto 1/A.

5.2.2 Architecture & Civil Engineering

Lightning Protection – Vajra Chumbata

  • Tall stupas (Ruwanweli-seya, Jethavanaramaya) in monsoon-rich dry zone never recorded lightning damage.
  • Bronze/metal apex finial acted as lightning conductor, channeling static electricity safely.

Ruwanweli-seya Foundation (2nd c. B.C.)

  • Excavation depth = 7 riyanas (cubits).
  • Sequential layers:
    1. Crushed limestone + water compacted by shoed elephants.
    2. Wendaru clay interlayer.
    3. Additional stones; gravel.
    4. Crystal layer.
    5. “Navaneetha” clay smear.
    6. Iron net coated with wood-apple resin & chemicals (waterproof reinforcement).
    7. Ransiriyal stones soaked in sesame oil (anti-capillarity).
  • Parallels modern reinforced concrete and damp-proofing.

Bridges & Roads

  • Granite-block bridge across Malvathu Oya shows mastery of span, abutment, and pier science.

Urban Planning – Sigiriya (5th c. A.D.)

  • Rock summit palace \approx 3\,\text{ha} at elevation 200\,\text{m}.
  • Royal precincts: East approach 40\,\text{ha}, West approach 90\,\text{ha}.
  • Defensive brick wall perimeter \approx 10\,\text{km}; moats 8\,\text{km} total.
  • Strict bilateral symmetry in water-garden (“Kshudra Jala Udyanaya”).

Hygiene, Medicine & Public Health

  • Mahāvaṃsa references:
    • King Pandukabhaya (4th c. B.C.) – maternity homes (Sivikasala).
    • King Dutugemunu (2nd c. B.C.) – 18 hospitals.
  • Alahana-Pirivena (Polonnaruwa) excavation (1982):
    • Hospital footprint 147.5\,\text{ft} \times 109.2\,\text{ft}.
    • Surgical instruments recovered → knowledge of anatomy & metallurgy.
  • Sanitation engineering:
    • Deep-shaft latrines, dedicated waste channels, bath-house overflow pipes.
    • Seven latrines per building ratio at Alahana shows design for user hygiene.

Ancient Metallurgy – Iron Leaching (Smelting)

  • Earliest slag fragment: Beragala tomb \approx 2400\,\text{B.C.}
  • High-temperature requirement: iron melts at 1538^{\circ}\text{C}.

Wind-Powered Furnaces – Samanala Wewa (3rd c. B.C.)

  • Furnaces oriented on mountain face; night-time katabatic winds provided continuous air blast for \approx 12 h.
  • Ore types: limonite & hematite.
  • Charcoal from “Maran”/“Yakada Maran” trees used as reducing fuel.

Bellows-Driven Furnaces – Dehigaha Elakanda (180 B.C.–200 A.D.)

  • Manual bellows supplied forced draft.

Indigenous Measurement Systems

Land Area

  • 1 Karisa = 4 Amunas; 1 Amunu = 2\,\text{acres}.
  • Sub-multiples: Pela, Kuruni, Laha (see figure below).
Laha 40 = Pela 1
Pela 12 = Kuruni 1
Kuruni 4 = Amunu 1
Amunu 0.25 = Karisa 1
  • Inscriptions cite grants: e.g.
    • King Bathikabhaya – 1 Karisa to local stupa.
    • King Kutakannabhaya – 8 Karisa to Tissa-vihara (Horiwila).

Linear Measures

  • Atomic-scale conceptual start → Paramanu.
  • Chain (multiplicative ×36 or ×7) up to Angula, Viyatha (9 in).
  • Long range: Gawwa, Yoduna, Usaba.
    • Nissankamalla erected Gawuthakanu milestones every Gawwa (akin to kilometre posts).

Weight

4 Veeha = 1 Gunja
2 Gunja = 1 Masaka
2.5 Masaka = 1 Aka
8 Aka = 1 Dharana
5 Dharana = 1 Swarna
2 Swarna = 1 Pala
  • Sorabora-wewa inscription forbids non-standard weights & measures → early consumer protection.

Numerals

  • Indigenous glyphs for 1–4000 recorded; see Chart 5.1 (not reproduced here).

Time Reckoning

  • Lunar month: 30 days (15 Purapaksha new→full, 15 Awapaksha full→new).
  • Year terms:
    • Varshaya
    • Vasa / Havajara (⇒ modern “Avurudu”).
  • Day = Thithiya; sub-unit = Muhurtha (Mohotha).

Applied Physics Artifact – Dedigama Elephant Lamp (Eth Pahana)

  • Bronze oil reservoir inside elephant’s abdomen.
  • Oil flows to wick via trunk/urethra using principles of non-motile (static) hydrodynamics & self-regulating siphon.
  • Demonstrates grasp of fluid-level equilibrium and atmospheric pressure.

Key Concepts & Takeaways

  • Science = understanding natural laws; Technology = leveraging them for practical tasks.
  • Sri Lankan proto-scientists developed bespoke units for length, weight, area, and time, showing advanced mathematical abstraction.
  • Monumental hydrology (tanks, sluices) spread across South Asia; stands equal to Chinese, Mesopotamian engineering in global history.
  • Ethical/administrative dimension: state-regulated measurement standards ensured fairness in trade (Sorabora pillar).
  • Integration of environment: wind-powered smelting, gravity-fed gardens, waste-safe latrines illustrate sustainable engineering.
  • Many village rites (e.g.
    • Kirimadu Yagaya) and ritual architectures (Galpaya Devalaya) encode indigenous problem-solving knowledge, blending empirical science with cultural practice.

Recommended Activities (from text)

  • Write newspaper article/essay showcasing ancestral scientific & technical prowess.
  • Identify local identity markers within proto-historic technologies.