Students increase their vocabulary and knowledge base while learning about different types of machines. In this machine lesson, students glue pictures of the machines they like onto paper and share their collages with classmates.

In this online quiz learning exercise, students answer a set of questions about how to socialize puppies. Answers may be submitted for review by clicking a link at the bottom of the page.

English scientist William Crookes was very innovative in his investigations with vacuum tubes and designed a variety of different types to be used in his experimental work. Crookes tubes are glass vacuum chambers that contain a positive...

Siegmund Loewe was a German engineer and businessman that developed vacuum tube forerunners of the modern integrated circuit. He pioneered both radio and television broadcasting, and the company he established with his brother, David...

American inventor Lee De Forest was a pioneer of radio and motion pictures. He received more than 300 patents over the course of his lifetime, the most important of which was for a three-electrode vacuum tube, or triode, that he called...

John Ambrose Fleming was an electronics pioneer who invented the oscillation valve, or vacuum tube, a device that would help make radios, televisions, telephones and even early electronic computers possible. A brilliant innovator,...

Walter Houser Brattain discovered the photo-effect that occurs at the free surface of a semiconductor and was co-creator of the point-contact transistor, which paved the way for the more advanced types of transistors that eventually...

This lesson will orient the student to the operation of vacuum operated and hydraulically assisted power booster units. The student will be able to effectively diagnose and repair problems with these systems at the conclusion of the lesson.

A biography on audion inventor, Lee de Forest, from childhood on. Hyperlinks to additional information about the radio and broadcasting.

A labeled photo of a 2D xray diffractometer located at the University of Helsinki. The labeled parts include the beamstop, slits, sample, vacuum tube and image plate detector.