Maps and survey . ryrepetition or duplication. Were the chain a chain of trianglesonly, there would be no check upon the survival of a gross regular system of quadrilaterals gives the most simplearrangement consistent with strength. It will often happen that more rays can be observed from acertain station than are required by the plan. To observe theserays would confuse the work without adding anything of to its accuracy. Hence the desirability of making astrict programme of the rays to be observed at each station,neglecting all others. The triangles must be well condition
Maps and survey . ryrepetition or duplication. Were the chain a chain of trianglesonly, there would be no check upon the survival of a gross regular system of quadrilaterals gives the most simplearrangement consistent with strength. It will often happen that more rays can be observed from acertain station than are required by the plan. To observe theserays would confuse the work without adding anything of to its accuracy. Hence the desirability of making astrict programme of the rays to be observed at each station,neglecting all others. The triangles must be well conditioned : that is to say, theymust be strong in shape, having no angles less than 30^ about,and if possible none less than 40°. The size of the triangles willdepend so much on the nature of the country that no generalrule can be laid down, beyond saying that the larger they arethe better. The connection of the bases with the chains of quadrilateralsalso depends very much on the ground. The main idea is that Plate XVII. I. Reconnaissance ladder on the march. ^-^iO-*-
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsurveying, bookyear19
