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Useful Optics
Students and professionals alike have long felt the need of a modern source of practical advice on the use of optical tools in scientific research. Walter T. Welford's Useful Optics meets this need. Welford offers a succinct review of principles basic to the construction and use of optics in physics. His lucid explanations and clear illustrations will particularly help those whose interests lie in other areas but who nevertheless must understand enough about optics to create the experimental apparatus necessary to their research. Consistently emphasizing applications and practical points of design, Welford covers a host of topics: mirrors and prisms, optical materials, aberration, the limits...
Aberrations of Optical Systems
Although the subject of optical design as a branch of applied physics is over one hundred years old, the use of aberration theory has changed considerably. Aberrations of Optical Systems covers elementary optics and aberration theory of various optical systems, including the use of nonaxially symmetric systems and diffractive optical elements in complex designs, such as head-up displays and the increasing use of scanning systems with laser illumination. The book provides the complete range of mathematical tools, formulae, and derivations needed for understanding the process of optical design and for planning optical design programs. While the treatment is mainly based on geometrical optics, some excursions into physical optics are made, particularly in connection with the problems of optical tolerances.
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When We Got Lost in Dreamland
The landmark new novel from Ross Welford, one of the fastest-growing and most critically acclaimed middle grade authors in the UK, this funny, moving and brilliant sixth book cements his position as the most exciting storyteller around for readers of 10+.
The Dog Who Saved the World
The astounding new novel from the bestselling and Costa-shortlisted author of Time Travelling with a Hamster, this is a story for everyone of ten and older who loves adventure, laughs and tears.
Into the Sideways World
The moving, funny, thrilling and adventured-filled new novel for readers of 10 and up from bestselling author Ross Welford.
What Not to Do If You Turn Invisible
From the author of the unforgettable bestseller TIME TRAVELLING WITH A HAMSTER comes another surprising, beautiful and funny novel about a child who, by disappearing, will write herself into your heart forever...
Time Traveling with a Hamster
Back to the Future meets The Curious Incident of the Dog in the Night-Time in this original, poignant, race-against-time story about a boy who travels back to 1984 to save his father’s life. My dad died twice. Once when he was thirty-nine and again four years later, when he was twelve. On his twelfth birthday, Al Chaudhury receives a letter from his dead father. It directs him to the bunker of their old house, where Al finds a time machine (an ancient computer and a tin bucket). The letter also outlines a mission: travel back to 1984 and prevent the go-kart accident that will eventually take his father’s life. But as Al soon discovers, whizzing back thirty years requires not only imagination and courage, but also lying to your mom, stealing a moped, and setting your school on fire—oh, and keeping your pet hamster safe. With a literary edge and tons of commerical appeal, this incredible debut has it all: heart, humor, vividly imagined characters, and a pitch-perfect voice.
