Maps and survey . Fig. 3. Methods of figuring contours.(«) right; {b), {c) and {d) wrong. enables the eye to follow the run of the contours, and is a greathelp in reading the form of the ground. It tends to give themap a stepped appearance, and isolated hills seem to be ridgedlike oyster shells, as may be seen especially in the 1/62,500maps of the United States. But this is a small matter in com-parison with the real advantage of being able to follow thecontours readily. 26 MAPS The worst way of accentuating each tenth contour is tochain-dot it, as in the Swiss maps on the scale of 1/50,
Maps and survey . Fig. 3. Methods of figuring contours.(«) right; {b), {c) and {d) wrong. enables the eye to follow the run of the contours, and is a greathelp in reading the form of the ground. It tends to give themap a stepped appearance, and isolated hills seem to be ridgedlike oyster shells, as may be seen especially in the 1/62,500maps of the United States. But this is a small matter in com-parison with the real advantage of being able to follow thecontours readily. 26 MAPS The worst way of accentuating each tenth contour is tochain-dot it, as in the Swiss maps on the scale of 1/50, dotted contours, which are the only ones figured, dis-appear except under close attention, and the whole systembecomes nearly unreadable. It is instructive to take one ofthese maps and to ink in the dotted contours, thus renderingthem heavier than the rest. Immediately the map becomesreadable. We have said that the contour interval must be equalthroughout, and that any departure from this rule is veryinconven
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurveying, bookyear19
