Blader door items (45 in totaal)

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,…