Demonstration of the hose fire sprayers in the courtyard of the exhibition in Amsterdam, ca. 1670-1680, Laurens screen (attributed to), 1735 print Demonstration of the use of the hose fire sprayers by spraying water and over the tower of the stock market (ca. 1670-1680). Later state (with the letter) is plate 23 in the reprint of the fire spray book by Jan van der Heyden from 1735. paper etching / engraving pump (fire-extinguishing equipment). Exchange, Bourse Fair of Hendrik de Keyser

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