. De re ichnographica : cujus hodierna praxis exponitur, et propriis exemplis pluribus illustratur : inque varias, quae contingere possunt, ejusdem aberrationes, posito quoque calculo, inquiritur . r> Pro (*) Videatur figura pag. 26, & 28- DE RE ICHNOGRAPHICA. 15 ProalteroPIano rsxy Regula dirigitur adObjecluminfra Horizontem , fecundum vifualem lineam mh. &collineatio fit per Ocuum,Dioptras r f admotum. Patecautem requiri, ut extremitas b Regulae promineat extra_jTabulam, quantum fufficit Vifiiali mh, tendenti ad Ob-je£ta infra Horizontem. ->n>

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