. first, and then the Hydrogen. Force outany Gas that may remain in the Bags; and, if the Apparatus is not to be used im-mediately, the Bags will be better preserved by hanging them up in a dry, coolToom, where there will be a free circulation of air. Directions for Making Pressure Boards. The Pressure Boardsshould be made of first-quality lumber, free fromknots or imperfections—planed smooth on bothsides, tongued and groov-•ed. Make them 32 incheswide, 42 inches 6 incnes wide ateach end of the lowerboard. The upper batt
. first, and then the Hydrogen. Force outany Gas that may remain in the Bags; and, if the Apparatus is not to be used im-mediately, the Bags will be better preserved by hanging them up in a dry, coolToom, where there will be a free circulation of air. Directions for Making Pressure Boards. The Pressure Boardsshould be made of first-quality lumber, free fromknots or imperfections—planed smooth on bothsides, tongued and groov-•ed. Make them 32 incheswide, 42 inches 6 incnes wide ateach end of the lowerboard. The upper battenof the top board net 6 in-ohes back from the end,to make a rest for theweights. The battensscrewed on, not nailed,•care being taken that theends of the screws do notproject through and thus injure the bag. The two boards hinged together by wrought iron strap hinges,bent over, and screwed to outside of the battens. Leave about half an inch spaceTaetween the boards to allow for thickness of bag. (The strap hinges can be fur-aiished at 50 cents a pair)..
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectproject, bookyear1888
