Blader door items (49 in totaal)

Many observers harbor misgivings about their telescope. The manufacturer may have guaranteed accuracy to one-quarter wavelength or as diffraction-limited but most telescope users have, at best, only a hazy idea of how to personally verifying such…

Many amateur astronomers make their own instruments, either because of financial considerations or because they are just interested. Amateur Telescope Making offers a variety of designs for telescopes, mounts and drives which are suitable for the…

This book is an compilation of articles from the newsletter "Maksutov Circulars", a telescope building organization dedicated originally to building Maksutov telscopes, an original, creative idea for telescope design largely fallen out of favor due…

This book is an compilation of articles from the newsletter "Maksutov Circulars", a telescope building organization dedicated originally to building Maksutov telscopes, an original, creative idea for telescope design largely fallen out of favor due…

This is an extensively revised, updated and enlarged edition of Dr Steel's popular textbook on interferometry. The book provides a general treatment that brings together the many different applications of the interference of electromagnetic waves.…

Featuring a collection of models to make, they tell the time from the sun during the day and the moon at night. Another mimics the motion of the sun and moon across the sky on any day of the year. The moon globe names all the seas, craters and…

A collection of working models of sundials and timedials to be cut out and glued. The models include polar, equatorial, sunbeam equatorial, traditional, three-in-one and a nocturnal dial and include a minibook which gives background information,…