Quarter circle with degree scale e heat pump: o que têm em comum

1. Passo 1. Quarter circle with degree scale — faz parte de — Quadrant. A scale from 0 to 90°.
2. Passo 2. Quadrant — tem como parte — Plumb bob. A plumb line shows the vertical.
3. Passo 3. Plumb bob — é feito de — Stone. The bob of a plumb line is stone or copper.
4. Passo 4. Stone — é material para — Ice house. Ice houses were built of stone and sunk into the ground.
5. Passo 5. Ice house — evoluiu para — Refrigerator. The refrigerator replaced natural ice.
6. Passo 6. Refrigerator — funciona como — Heat pump. A heat pump is a refrigerator that heats the house.

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