Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
622. Figure 49.—Unlike poles neutralize each other.— A combination of two or more magnets, with their like poles in con-tact, exerts a greater force than one alone, or even greater than the sumof their forces, applied separately. But if two equal magnets be com-bined, with their unlike poles in…
Physics · Astronomy
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![An illustration from Architectura curiosa nova, exponens 1. Fundamenta hydragogica, indolemq[ue] aquæ, aëris interventu in altum levandæ. 2. Varios aquarum ac salientium fontium lusus per varia spectatu jucunda epistomiorum seu siphonum genera. 3. Magnum amnissimorum fontium, machinarumq[ue] aquæductoriarum sumtu magno exstructarum, ac per Italiam, Britanniam, Germaniam &c. visendarum, numerum. 4. Specus artificiales sumtuosissimas, cum plerisq[ue] principum europæorum palatiis, hortis, aulis; nec non præcipuis monasteriis atq[ue] arcibus. 5. Cum auctario figurarum elegantissimarum, ad hortorum topiaria vario ductù dividenda, nec non conclavium laquearibus ac pavimentis segmentandis, itemq[ue] labyrinthis construendis, adhibendarum. Omnia 200 æri incisis... descripta (1664)](https://img.insideoutlibrary.com/img/200/ia-architecturacuri00bock-52-21.webp)
