Elementary principles of carpentry ... : ; to which is added an essay on the nature and properies of timber (1840)
Tredgold, Thomas, Barlow, Peter · John Weale · leaf 322
292 APPENDIX . … It has already been noticed that the vault is formed of the four quadrants ( or rather of oblong portions of them ) of an inverted concave conoid . In order to place this in the clearest point of view , D , fig . 1 , is Supposed to represent a figure of this form in per spective standing on its…
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