fig. 104.

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being set out from the line cd towards e, the width of archivolt mouldings 1, 2, 3, &c., as ae} from c towards a.

Example 102, fig. 104, is the Composite impost, the projections being set from the line bb* The scale from which the measurements should be taken is the same for all the imposts, being that in fig. 62.

Example 103, fig. 105, shews a 1 pediment' cc, the tympanum, is .generally filled in with sculpture. In our work on Practical Geometry, in

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