very needle point. Such accu- acting on the arch between a and c, not racy is moreover essential to properly including the reaction R at a. Then on testing an arch ring. It is well to ob- serve that the constructions can be made combining ~R=ak, with P, we get the by drawing only a very few lines.… … with S, gives a resultant acting between corresponding to the resultant R — .ah, T and S, which therefore cuts the joint acting through a in the direction ok. nearer kl than the first center of press- Let axb cxd ex be a second curve, cor- responding to the reaction R' at ax. Now ure. The above…
Engineering
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