The Stone Pullers of Nagaland

The Feast of Merit

In the Angami Naga villages of the Kohima region, wealth was not measured in gold or land. It was measured in generosity. A wealthy man who wanted respect had to earn it by hosting a great feast — the Feast of Merit — feeding the entire village for days. And to mark the feast permanently, he had to drag a megalith — a massive stone, sometimes weighing 10 tonnes or more — from the quarry to the village, where it would stand forever as a monument to his generosity.

Kezhakeno Iralu — called Kezhako — was seventeen and fascinated by the megaliths that lined the path into his village, Khonoma, one of the oldest continuously inhabited villages in Nagaland. The stones were huge — 3 metres tall, 2 metres wide, and so heavy that even imagining moving them seemed impossible.

"How did they do it?" he asked his grandfather, Apfü Viraho, who remembered the last stone-pulling ceremony held in the 1960s.

"With ropes, logs, and many men," said Apfü. "And with something your physics teacher would call... simple machines."

The Inclined Plane

The quarry was 2 kilometres from the village, uphill. Lifting a 10-tonne stone straight up (even 1 metre) would require a force of about 100,000 Newtons — far beyond what any group of humans could lift directly.

"So they didn't lift it," said Apfü. "They rolled it along an inclined path."

The path from the quarry was graded — a gentle slope, never steeper than about 10°. An inclined plane trades force for distance: to raise a stone 50 metres vertically, you might walk 300 metres along a slope. The force needed is reduced by the ratio of height to slope length.

Force along slope = Weight × sin(θ) = 100,000 × sin(10°) ≈ 17,400 N

That's 17% of the direct lift force. With 100 men pulling (each contributing about 200 N — a firm pull), the team could generate 20,000 N — just enough, with some margin for friction.

Log Rollers

But pulling 10 tonnes across bare ground creates enormous friction. Even on a smooth path, the friction force could equal half the stone's weight — 50,000 N. The inclined plane helped with gravity, but friction would defeat the team.

The solution: log rollers. The villagers placed smooth, round logs under the stone. As the stone was pulled forward, it rolled over the logs instead of dragging on the ground. This converted sliding friction (high) to rolling friction (much lower — about 10% of sliding friction).

With rollers, the friction dropped from ~50,000 N to ~5,000 N. Combined with the inclined plane reduction, the total pulling force needed was approximately: 17,400 (gravity component) + 5,000 (rolling friction) = 22,400 N — achievable by 100–120 strong men pulling in coordination.

Logs that the stone had passed over were carried forward and placed at the front — a process called relay rolling that required coordination, timing, and a team dedicated to log management.

The Rope and Leverage

The ropes were made from cane — strips of rattan woven into cables as thick as a man's wrist. Cane rope has a tensile strength of about 30 MPa — comparable to mild steel wire of the same thickness. It is flexible, lightweight, and doesn't rot quickly.

At difficult sections (steep pitches, sharp turns), the team used levers. Long wooden poles were wedged under the stone's edge, and men pressed down on the free end. A lever with a 3:1 ratio (the load arm is one-third the effort arm) multiplies the input force by 3. Ten men pushing with 500 N each on the long end of a lever could generate 15,000 N at the short end — enough to tip or shift the stone.

The Final Erection

The most dangerous moment was raising the stone upright at its final position. The team dug a deep, sloped pit. The stone was dragged to the pit's edge and tipped in, sliding down the slope until it stood nearly vertical. Then they packed earth around the base.

Kezhako calculated: raising a 10-tonne, 3-metre stone from horizontal to vertical requires work = mgh = 10,000 × 9.8 × 1.5 (centre of gravity rises 1.5 m) = 147,000 Joules. With 100 men working for about 10 minutes, each contributing about 75 Watts (moderate physical effort), total energy = 100 × 75 × 600 = 4,500,000 Joules — more than enough, even accounting for efficiency losses.

The stone at Khonoma still stood, exactly where it was placed perhaps 200 years ago. Kezhako touched its rough surface. No crane. No engine. No machine except the ones invented by physics itself: the inclined plane, the roller, the lever, and the rope.

Simple machines. Simple names. Not so simple to use when the stone weighs as much as an elephant and the hill is steep and the only power source is human muscle and coordinated will.

The end.