Rotary Perforating Machine
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One operator controlled the registration as the web of stamps was manually fed into the perforator; the second operator examined the quality of the perforations; and the third operator removed the sheets. Each perforator was equipped with two separate perforating units. The wheel unit produced the horizontal lines of perforation and the bar unit produced the vertical lines of perforation."}, {"label": "Description", "content": "Since the rotary perforators were manually controlled and were a new invention, a high percentage of mutilation, as well as low quality perforations, occurred in stamp production. Approximately 21 percent of all postage stamps perforated were spoiled and had to be destroyed. A high percentage of all circulating postage stamps had poorly centered perforations due to imperfect registration. This resulted in numerous complaints and criticisms by stamp users."}, {"label": "Description", "content": "To overcome deficiencies of the manually operated machines, an electronically controlled perforating machine was conceived, developed, and constructed by Henry J. Holtzclaw, who succeeded Mr. Stickney at the Bureau of Engraving and Printing. The bureau first used the electric-eye perforator in 1933, which eventually made obsolete the first rotary perforators. The new machines increased rates of speed with less mutilation and greater accuracy of perforations."}], "place": [{"label": "Place", "content": "United States of America"}], "setName": [{"label": "See more items in", "content": "National Postal Museum Collection"}], "creditLine": [{"label": "Credit line", "content": "Transfer from The Department of the Treasury, Bureau of Engraving and Printing"}], "dataSource": [{"label": "Data Source", "content": "National Postal Museum"}], "identifier": [{"label": "Object number", "content": "0.226540.3"}], "objectType": [{"label": "Type", "content": "Printing Equipment"}], "physicalDescription": [{"label": "Medium", "content": "metal"}, {"label": "Dimensions", "content": "Height x Width x Depth: 42 \u00c3\u0097 36 \u00c3\u0097 22 in. (106.68 \u00c3\u0097 91.44 \u00c3\u0097 55.88 cm) Height x Width x Depth (Crate Dimensions): 54 \u00c3\u0097 44 \u00c3\u0097 39 in. (137.16 \u00c3\u0097 111.76 \u00c3\u0097 99.06 cm)"}]}, "indexedStructured": {"date": ["1910s", "1930s"], "name": ["Bureau of Engraving and Printing", "Crown Cork & Seal Company"], "place": ["United States of America"], "geoLocation": [{"Other": {"type": "Place", "content": "United States of America"}}], "object_type": ["Printing and printmaking equipment"], "online_media_type": ["Images"]}, "descriptiveNonRepeating": {"guid": "http://n2t.net/ark:/65665/hm8536cceac-e9bf-4621-b48d-35ec29123fa2", "title": {"label": "Title", "content": "Rotary Perforating Machine"}, "record_ID": "npm_0.226540.3", "unit_code": "NPM", "title_sort": "ROTARY PERFORATING MACHINE", "data_source": "National Postal Museum", "record_link": "https://postalmuseum.si.edu/object/npm_0.226540.3", "online_media": {"media": [{"id": "damsmdm:NPM-0_226540_3e", "guid": "http://n2t.net/ark:/65665/sy792ab967b-25dc-46b8-a3fe-58ecc6ce2c8d", "type": "Images", "idsId": "NPM-0_226540_3e", "usage": {"access": "CC0"}, "content": 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