. The Locomotive . he centering of the boltin the pipe can readily be observed. Wooden boxes may be used,of course, instead of the pipe but when used they should be madewet before the concrete is poured. This will prevent the wood ab- I92I.] THE LOCOMOTIVE, 171 Spocar Template. sorbing moisture from the concrete — which would prevent the forma-tion of a hard concrete — and it is of value also in that the boxes will later dry out, shrink, and thusbe easy to remove from the foun-dation. The washers for use on thelower end of the holding-downbolts may be made of cast iron andshould be of good siz
. The Locomotive . he centering of the boltin the pipe can readily be observed. Wooden boxes may be used,of course, instead of the pipe but when used they should be madewet before the concrete is poured. This will prevent the wood ab- I92I.] THE LOCOMOTIVE, 171 Spocar Template. sorbing moisture from the concrete — which would prevent the forma-tion of a hard concrete — and it is of value also in that the boxes will later dry out, shrink, and thusbe easy to remove from the foun-dation. The washers for use on thelower end of the holding-downbolts may be made of cast iron andshould be of good size. Propor-tions for these washers are givenin Table II. The nut on the lowerCentering end of the bolt willbe held fromDisNS. turning if the concrete, whenpoured, is puddled or roddedaround the lower end of the boltalthough it is advisable to havethe bolt extend through the lowernut for about twelve inches and tohave this extension bent out ofline so as to act as a lever. Ridgesmay also be cast on the foundation. ^W\ foandationWasher Fig. 8. washer to prevent turning of the nut. In many cases, especially those in which the foundation boltsextend for some distance above the top of the foundation, it will beconvenient to have the bolts so installed that they may be removed, Table of Cast Iron Foundation-Washers. Dia ofBolt A B C I) \ / / 1 TL \ . \ E,■ 1 r 61/2 21/2 % 1^ P Wz 9H 2>V2- W 2% / / \ / 1 \ -) 13 41/ 1^4 2>^ / Cored hole -^ 2 i 16 5 2H 1 3ir i 13424 172 THE LOCOMOTIVE, [April,
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