41. Temporary chutes had to be built through abandoned elevator shafts and street gratings to deliver concrete. 42. Top with whipped topping and gratings . 43. Gather the gratings together, squeeze out the juice into the bowl and discard the pulp. 44. His grater caught the gratings , and he flipped the box of onions into the mixture. 45. Sine-wave gratings are used extensively in optics to determine the transfer functions of lenses. 46. Other elements, such as prisms and diffraction gratings often need large quasi-collimated beams. 47. In 1988, the first Raman fiber laser based on fiber Bragg gratings has been made. 48. For a given distance between the dispersive elements, prisms generate much less dispersion than gratings . 49. The cream-painted walls feature gilded gratings and mirrored arches and display a Flemish tapestry. 50. The diffraction gratings are nano fabricated materials with a separation of a quarter wavelength of light.
