me, and palatable con- as the "retaining room," the keys of which never erating room the beef that is to be shipped is wheeled dition. pass out of the hands of the government officials. In out on overhead rails into the refrigerator cars, where Broadly speaking, there are three methods of preser-… … are huge hollow blocks of reinforced concrete, eacB One of the strongest impressions produced upon a Fig. 1.—Building the caisson. visitor to the packing houses is that every possible weighing 120 tons in air. They are 24 feet in length, precaution is being taken to insure the entrance only 15 feet…
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