Portlight, anonymous, c. 1832 portlight Round patent glass in a wooden porthole. The glass has used the convex matte side to the outside and is in the wood, so that it does not protrude; The edge of the glass is sandwiched between the two layers of wood. A layer of cardboard is installed between the layers of wood. A horseshoe -shaped batter is indicated outside with scratches. Netherlands wood (plant material). glass. cardboard. iron (metal). putty (sealing compound)

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