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

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

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Considerable space will also be allotted to rolling stock and the great variety of cars which can be put into use on your model empire; that is, the types and services they perform. And while this book primarily embraces tiie golden age of steam locomotion, the manner 16 illustration in \Var oldtimers and buffs. Civil historic locomotives get their rat's nest of wires beneath your layout. Considerable space devoted to the is and availability of radio-frequency control, which is probably the greatbreakthrough since the advent of miniature trains.

Uuliiig in . . general pioblcnis. 25 of -'^y,, -mm fL §-:#*' But indefatigable the for these of efforts pioneering scale railroaders in their unflinching climb toward standardization and solidarity among the fellowship of model railroading, our hobby as we indulge in it today might still be devoid of any relation to conformity and prototype standards, and would no doubt be classed still " as a "plaything. If you are interested in a more detailed accounting of the NMRA, how it came into being, and a greater insight into plishments, I its accom- you join the heartily suggest NMRA.

I. Burlington Qumcy fe gleaming brass and fully ornamented with the necessary detailing and styling to con- all form to true prototypical design. By and large, these particular track-tested items require additions in the way no of detailing or improve- ment, since they have been exactingly pro(some in limited quantity) to the duced ultimate degree in scale miniaturization and workmanship, certainly on a much higher level than mass production and factory assembly will allow. In our own area of native manufacture, we also find customized equip ment that has reached the highest plateau in wtjrkmanship and scale reproduction.

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