Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 626
and the largest the third in the layers, whilst the fourth is blank, the wax belowwhich not only secures all the flaps, but adheres also to the enclosure. When a piece of blotting-paperis placed below the holes, as in another modification, any attempt to open the letter would involve atear. 1594.… … The ordinary four-cornered envelop, fitted to form what M. Remond calls the Detector, appears toanswer all the requisites of security and elegance. The sealing-flap is embossed with some device, thecentre of which is perforated in any ornamental way, and a colored wafer is placed beneath it,…
Mechanical engineering
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