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Vitreography is a fine art printmaking technique that uses a 3 ⁄ 8-inch-thick (9.5 mm) float glass matrix instead of the traditional matrices of metal, wood or stone. A print created using the technique is called a vitreograph.
Pressed glass (or pattern glass) [1] is a form of glass made by pressing molten glass into a mold using a plunger. [2] Although hand pressed glass has existed for over 1,000 years, the use of a machine for pressing was first patented by Pittsburgh glass man John P. Bakewell in 1825 to make knobs for furniture.
Pressed glass: The most important innovation for the 1820s was the development of machine pressed glass—pressing glass into a mold. [21] Although pressing glass by hand had long existed, mechanical pressing of glass did not exist until the 1820s—and it was an American invention. [ 29 ]
Pressed glass is patterned only on the exterior and smooth inside. [26] Pressed glass, termed “mold-pressed,” has an interior form independent of the exterior, in contrast to mold-blown glass, whose interior corresponds to the outer form. [27] Plates, lamp bases and door knobs were usually made of pressed glass. [28]
Many of the pressed pieces appear to be cut glass on casual inspection, due to the high quality of the glass and the crispness of the molding. The majority of the pieces are impressed with the company logo, a raised capital letter "H" inscribed in a diamond of approximately 1 ⁄ 4 inch (6.4 mm) in length. This mark is found on the bottom of ...
Hobnail glass is pressed glass with a pattern of raised bumps. It was created in 1886 at Hobbs, Brockunier and Company by William Leighton Jr. and William F. Russell. [85] Their patent, No. 343,133, discussed projecting nodules and improvements in "pressed opalescent glassware". [86] This style was the company's pattern 323.
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