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By Nicholls, Harry R., Johnson, Charles F., Duvall, Wilbur I.

File issued by means of the Bureau of Mines over the consequences of air blast vibrations. As said within the summary, "this file offers the result of the Bureau of Mines 10-year software to review the matter of air blast and floor vibrations generated via blasting" (p. 1). This file comprises tables, and illustrations.

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One is to shape each trackboard by beveling, then apply asphalt roofing W TRACKWORK 61 paper to the board. This simulates the material quite well. possibility is to paint carefully the proper places Another with water glass or wall gravel. The sizing, then sprinkle with very fine gluey material holds the gravel, while it can be shaken or brushed from other sections. A different approach is to make a mixture of sizing and gravel so that there is a light coating of the cement on each bit of gravel.

The carpentr}' will place no great demands on anyone who can hammer home a nail. The rest can be learned. The cellar layout shown above is a neat job by a good home carpenter. It is the sort of road that is aimed at. It is not the sort which one attempts at first unless unusually skilled. In getting wood for your road, there are only two important rules: (1) don't get green wood, for it will warp and your tracks will be out of line forever, and (2) don't TABLEWORK FOR MODEL RAILROADS buy exf)ensive wood, for there are better things to 47 do with the money.

They are fastened with small nails that do not split the wood. niere are many ways of making ballast. One is to shape each trackboard by beveling, then apply asphalt roofing W TRACKWORK 61 paper to the board. This simulates the material quite well. possibility is to paint carefully the proper places Another with water glass or wall gravel. The sizing, then sprinkle with very fine gluey material holds the gravel, while it can be shaken or brushed from other sections. A different approach is to make a mixture of sizing and gravel so that there is a light coating of the cement on each bit of gravel.

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Blasting Vibrations and Their Effects on Structures by Nicholls, Harry R., Johnson, Charles F., Duvall, Wilbur I.


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