Projected Slides of Stadia Situations for Group Instruction and Examination

Abstract

For purposes of preliminary instruction or examination of large classes in stadia surveying, a great amount of time-consuming, individual supervision, necessitated by work with actual equipment, can be replaced effectively by using projected Kodachrome slides of various stadia situations. If slides, showing a stadia rod photographed from various distances and vertical angles, are projected onto a circular screen on which black lines have been ruled to simulate the stadia hairs seen through the telescopic alidade or transit, and if close-up slides of the instrument scales are projected onto an ordinary screen, a rather realistic “traverse” can be run in the classroom. This method permits simultaneous observation and recording of the rod and instrument scale values by all of the students in a class, for convenience in checking and instruction.