File:Constructive work; (1905) (14757044336).jpg

Identifier: constructivework00wors (find matches)
Title: Constructive work;
Year: 1905 (1900s)
Authors: Worst, Edward F. (Edward Francis), 1866-1949 Barber, Harriette, (from old catalog) joint author Seymour, Marian, (from old catalog) joint author
Subjects: Manual training Paper work Basket making. (from old catalog)
Publisher: Chicago, A. W. Mumford and company
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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now ready tomake the mold. Dope plays a very important part in themaking of a mold. To make dope take one quarter of a pound of castile soap.scrape fine and place in a dish with warm water enough tocover. Allow soap to dissolve. When fairly dissolved addone-half pint of purified lard oil—mix well. Give the completed form, still on the disk, a coat of thedope. (See left of Fig. XXIV.) 238 Surround the vase form with a cyHnder of hnolcum fromone to two inches greater than that of the vase form. (Seecenter of Fig. XXIV.) Pour plaster of paris into the spacebetween the vase form and the cyHnder of Hnolcum to adepth of at least one inch greater than the height of the vaseform. When the mold thus made becomes noticeably warmto the hand it may be lifted from the wheel. (See right ofFig. XXIV.) The vase form remains and the mold is laidaway to dry. It will be observed that any surface receivinga coat of dope prevents plaster from sticking. The moldjust completed is called a one piece mold.
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FIGURE XXV. If the shape turned upon the wheel has rounded sides themold must be made of two or three pieces, and the mannerof making such a mold is quite different from that of theone piece mold. The linoleum is placed and the plasterpoured the same as when making a one piece mold. Fig.XXIV. In making a two piece mold after the shape has been cutout, (See left of Fig. XXIII), of plaster it is taken off. 239 Usually hammer and chisel are used in cutting it loose fromthe disk. The disk is smoothed and the form inverted asshown in the left of Fig. XXV. In placing the inverted formcare should be taken that it is exactly in the center of thedisk. A pencil mark is made at the place where the cir-cumference is greatest. This is done while the disk is re-volving. After the form is thoroughly doped a cylinder of linoleumis placed around the form as shown in center of Fig. XXV,and liquid plaster is poured in to the height shown by the

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