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The image is a page from a textbook or manual on surveying. It contains text and diagrams explaining surveying instruments and methods. Specifically, it discusses the optical square and the field book. The text describes the "mirror method" and "prism square method" for setting out lines at right angles. It also explains the characteristics and usage of a field book, including how entries are made and what information is recorded. A diagram labeled "Fig. 21.6 Field Book" illustrates a survey plot with numbered points and lines representing survey lines. Another section of text on the right side of the page discusses line insertion for offsets and indicates that lines can be measured. There is no information or visual element in the image that relates to the city of Jalingo, Nigeria.
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