r by plates, gives the greatest amount of stiff- rate of about 18 miles per hour, including trips ness ; also vertical and lateral strength ; and practi- The business of a large post-office is always hur- made in fogs and gales. Two of them have been cally renders each arch one entire piece from… … lamp, the outer glass could never become heated, ‘“oomparatively. Another great advantage will be found in the facility with which the tubes can be and that the inner glass will admit of ample expan- severely at times. No matter how large the mail, sion; there can be no doubt either that, while the…
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