OBSTACLE RACE • DICTIONARY ONE.COM • Definition of Obstacle race

... is lessened; and, if the ray of light falls obliquely on a triangular piece of glass, the waves of different lengths part company as they travel through it, and the light is spread out in a band of rainbow-colour. The waves are sorted out according to their lengths in the "obstacle race" through the glass. Anyone may see this for himself by holding up a wedge-shaped piece of crystal between the sunlight and the eye; the prism separates the sunlight into its constituent colours, and these various colours will be seen quite readily. ...

— The Outline of Science, Vol. 1 (of 4) - A Plain Story Simply Told • J. Arthur Thomson

... that my father and mother will be delighted to see you. I have ten brothers and sisters, but there is miles of coast, and I and my five sisters have a sitting-room all to ourselves. Father says "he" must pass his examinations first. I tell you this because you will then understand. "He" won the obstacle race at the Anstells', but he was in a sack, so I expect you did ...

— The Professional Aunt • Mary C.E. Wemyss