. Railway maintenance engineering, with notes on construction . roofing coat is put next the inside boarding of the housewhich prevents moisture reaching the wall and lowering itsinsulation value. In the wall is placed a |-in. Linofelt covering. The method of insulation used in the Galesburg ice houseof the Chicago, Burlington and Quincy Ry., is shown by This design was adopted only after a very exhaustiveexamination of existing structures throughout the country andhas been frequently referred to in the technical press as repre-senting the best modern practice in ice-house constructio
. Railway maintenance engineering, with notes on construction . roofing coat is put next the inside boarding of the housewhich prevents moisture reaching the wall and lowering itsinsulation value. In the wall is placed a |-in. Linofelt covering. The method of insulation used in the Galesburg ice houseof the Chicago, Burlington and Quincy Ry., is shown by This design was adopted only after a very exhaustiveexamination of existing structures throughout the country andhas been frequently referred to in the technical press as repre-senting the best modern practice in ice-house construction. The shrinkage in this house is about 10 per cent, whichincludes as well the loss in crushing the ice and handhng to therefrigerators. ICING STATIONS 307 Examining the insulating value of this house we find forthe walls 612 2UI = 2 + (.81++++ 1 f Boards 93 fl 93 .03 Paper .27 2 Lith 25 6 Sawdust, nearly dry 75 Ceiling, 24M= ^ m ^^^ ^•^•^• 2++—j = E/C .81 .87 . ZxZBridgmg i^xSfF/rP/.._. Cross ■Section. Fig. 166.—Ice House with Mineral Wool Insulation, & Q. House, Galesburg. 308 RAILWAY MAINTENANCE Figs-. 147 and 167 show examples of cork insulation. InFig. 147, the drawing illustrates the wall section of a house forthawing coal, but the method of construction is much the sameas that used for an ice-house wall. Granulated cork is usedwhich is tamped until it is of the required density. As the corkis a by-product in the manufacture of cork-board, it is muchcheaper than cork-board insulation. Fig. 167 presents the insulation used in the Illinois Centralhouses. Here, in addition to the cork, flax quilt and paper areemployed and the inside of the house is plastered. The best shape for an ice house, other things being equal,is that which will give the maximum cubic capacity for the mini-mum wall area. This is found in a cube, and therefore the morenearly square an ice house can be built, the smaller t
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