1. 1931 Harold Urey discovers deuterium by fractionally distilling liquid hydrogen.

2. Running Backstays support the headstay in a fractionally rigged boat

3. The reaction mixture is fractionally distilled to recover unreacted isoalkanes as overheads and alkylate as bottoms.

4. The resulting mixture is fractionally distilled to purify and separate the germanium tetrachloride from other products and impurities.

5. 3 Nervous trembles ached in her legs and the floor was vibrating fractionally with the movement of some train deep underground.

6. Backstay Tensioner Easy Upgrades: #1 of a seriesEvery fractionally rigged boat will have (or should have) a means of adjusting Backstay tension