Collins, A. Frederick (Archie Frederick), 1869- · Boston, Small, Maynard and company · leaf 129
l whis-tle because it is fitted with a hollow top closedat the upper end and which somewhat resemblesa bell. The first thing you need to make a steamwhistle with is a stop-cock like the one just de- H4 The Boys Book of Engine-Building scribed. For a whistle of the right size for amodel locomotive… … PLUGENDSOLDER HERE B£IL
Steam-engines
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