Articles describing the construction and use of apparatus or electronic devices should be based on materials that are available at relatively low cost. While most submissions will describe devices that are inexpensive on an absolute scale, methods of accomplishing sophisticated results with much less than the usual expense will also be entertained.  New uses of available materials, not requiring fabrication, are likewise encouraged.

All manuscripts should contain specific information about how the authors have used the materials. Diagrams, illustrations, and photographs describing construction details must be clear and crisp so that they reproduce well. The advantages of using the materials, compared with other approaches to teaching the same concepts, should be described.