Thermal power station and telescope: what they have in common

1. Step 1. Thermal power station — uses — Natural gas. Gas.
2. Step 2. Natural gas — is used in — Bunsen burner. Gas.
3. Step 3. Bunsen burner — is used in — Spectroscope. The burner’s colourless flame made it possible to study the spectra of elements.
4. Step 4. Spectroscope — has part — Prism. A prism.
5. Step 5. Prism — is part of — Binoculars. Porro prisms flip the image.
6. Step 6. Binoculars — evolved from — Telescope. A double telescope.

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