Plough beam e LIGO: o que têm em comum

1. Passo 1. Plough beam — faz parte de — Plough. The beam to which the traces are attached.
2. Passo 2. Plough — evoluiu de — Hoe. The plough mechanized loosening the soil with a hoe.
3. Passo 3. Hoe — é feito de — Stone. The working part was of stone or antler.
4. Passo 4. Stone — é material para — Interferometer. Michelson’s instrument stood on a stone slab.
5. Passo 5. Interferometer — inclui — LIGO. An interferometer.

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