adding of many numbers, machines joints. Any one of these sections can be disconnectedfrom the other, and when so separated can be left atany point and loaded, wbile the rest of the vesselgoes after cargo at a distant point. The experimentsare said to be a success ; but it is a puzzle to us tosee… … have been invented, which, dependiug upon ab-solute mechanical motions and changes, producethe result of a sum much quicker than it could bedone mentally. Such an one is herewith illustrated.It is eminently convenient, light, portable ; has nomachinery whatever about it, and is always accurate—the…
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