For anyone who has ever dreamed of exploring the heavens with a telescope.

Complete, detailed instructions and numerous diagrams for constructing a do-it-yourself telescope. No complicated mathematics are involved, and no prior knowledge of optics or astronomy is needed to follow the text's step-by-step directions. Contents cover, among other topics, materials and equipment; tube parts and alignment; eyepieces, and related problems; setting circles; and optical principles. 1973 ed. Appendixes. Index. 6 plates. 100 figures.

This book provides an introduction to the design of a variety of telescopes, mounts, and drives suitable for the home-constructor. Projects include instruments that range from a shoestring budget to specialist devices that are not commercially available. The skill level of each project is indicated and advice is provided as to what is sensible to construct, given what is commercially available. Hints and tips are included, as well as listings of reputable mail order sources of materials and components.

For children, potential is limitless, curiosity is an electrical current, and every moment is open to the possibility of the unexpected. Day-to-day life is filled with adventure. Road blocks are invitations to try new routes. And the world is vast and expansive. This book is a celebration of childhood through the crafts and activities that invite wonder and play. The twenty-five projects and activities in this book are meant to speak to the way children engage with the world. These projects are not about what is produced in the end (although that part is fun too) but rather they are stepping-off points—activities that spark curiosity, an adventure, or an investigation. They’re about the process of getting there. They’re about the conversations that happen while making things together. They’re about getting to know the world inch by inch. They’re about exploring imaginary universes and running through real forests. They’re about living in childhood . . . regardless of your actual age. They’re about being a kid.

A guide to viewing stars, the moon, planets, meteors, comets, and aurora through binoculars. Features a foreword by renowned astronomer and writer David Levy. Includes a complete guide to current binocular brands and models and explains what to look for in each season.