Engineering and Contracting . vent moisture enteringthe wood and so when the board has become filled withthumb tack holes a second treatment is desirable. Removing Eraser Fragments. To remove easily the gummy eraser fragments aftercleaning a drawing shake powdered chalk over the chalk dries up the eraser fragments so that they canbe shaken or brushed off the drawing. Improvised Ink Bottle Holders. An effective ink bottle holder may be improvised froman ordinary iVo-in. steam pipe floor plate by setting thebottle in the pipe hole. Another resort where floorplates are not come at handi
Engineering and Contracting . vent moisture enteringthe wood and so when the board has become filled withthumb tack holes a second treatment is desirable. Removing Eraser Fragments. To remove easily the gummy eraser fragments aftercleaning a drawing shake powdered chalk over the chalk dries up the eraser fragments so that they canbe shaken or brushed off the drawing. Improvised Ink Bottle Holders. An effective ink bottle holder may be improvised froman ordinary iVo-in. steam pipe floor plate by setting thebottle in the pipe hole. Another resort where floorplates are not come at handily is two pieces of drawingpaper arranged as follows: Make a cylinder of paperabout twice as high as the barrel of the ink bottle andslip the ink bottle into one end and bind around withrubber bands. Slit the projecting end of the paper cyl-inder at a number of places and bend the strips outwardat right angles, after which paste the strips to a flatpaper base. Four thumb tacks through the paper basecomplete the bottle steam Pipe Floor Plate Ink Bottle Holder. shade in the usual manner. To cover the drawing tiltup the hinged strip and pull down the shade. Oilclothmay be substituted for the ordinary window shade clothand in place of the bottom stick a ^i-in. iron rod can beused; these are improvements over the standard windowshade. Weighing approximate method of determining the areas ofirregularly shaped surfaces is to plot the surface ondrawing paper, cut away all the paper outside the plattedsurface, weigh the paper included in the plat and divideby the weight of a known unit area of the same paper.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
