can be handled, and with the chamber. The following advantages are slightest waste of lumber. or pail flaring at the top so that its upper and outer edge This form:of the blocks does away with the necessity for the It is a comfortable chamber, easily supplied with earth, objectionable wood… … of April 28, 1870. well washed with water. The object may be BLISS’ These peculiar blocks of wedge shape, inter- accomplished, however, quicker by putting locking as they do at the bottom, and covering the entire sur- face of the carriage-way, when framed and keyed, constitute an unbroken arch,…
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