Microscopes allow scientists to examine everyday objects in extraordinary ways. They provide high-resolution images that show objects in fine detail. This brief article describes the many types of microscopes and how they are used in different scientific venues.

We describe new materials available at the Arecibo Observatory for visitors with visual impairments. These materials include a guide in Braille that describes the telescope, explains some basic terms used in radio astronomy, and lists frequently asked questions. We have also designed a tactile model of the telescope. Our interest is in enabling…

The making of microscope devices using inexpensive or recovered materials is demonstrated. Examples of images illustrating the performance of such devices are presented. As a project at the undergraduate level, the task is effective in acquiring familiarity with optical imaging concepts and their practical implementation in the laboratory.…

The construction of combined plastic membrane electrode for hydralazinium cation from a disposed glass electrode is described. A variety of electrodes could be prepared by students using other types of polymers, plasticizers, or exchangers which could also help to study effects of pH and temperature, or environmental investigations.

Understanding electricity is never easy, especially in introductory courses. Students cannot observe the underlying physical processes and are often, at the same time, being introduced to the use of new measuring instruments. The use of a simple ammeter, either analogue or digital, requires students to break the circuit whenever a change in…

A look at a program established to assist teachers in repairing and maintaining science equipment. A Science Instrument Repair Center has been set up at the northern branch of the Delaware Technical and Community College. (Author)

Making simultaneous observations with radio antennas continents apart, astronomers are getting information from space not available before. The technique can be used to obtain information related to many problems on earth also. (RH)

Describes the construction of an inexpensive habitat for maintaining amphibians in the classroom. (PB)

Techniques for detection and measurement of carbon monoxide (CO) in air are of interest and utility in many aspects of automotive safety. CO concentrations may range from less than 100 parts per million (ppm), or 0.01 percent, to about 10 percent by volume. Gas indicator tubes have been used for many years primarily as detectors of hazardous gases…

The sensor is a mass spectrometer system which continuously monitors the atmospheric constituents of hydrogen, water vapor, nitrogen, oxygen, and carbon dioxide, and monitors the Freons on a demand sampling basis. The manual provides a system description, operational procedures, and maintenance and troubleshooting instructions. Circuit diagrams…