Pressed Glass 1800–1920
The Genesis of Mechanical Pressing (1820–1840)
Although the process of forcing glass into a mould to impart shape dates back to antiquity, the mechanisation of this technique was 19th-century American breakthrough. Prior to the 1820s, hollow items were shaped through free-blowing or mould-blowing, tasks that demanded great skill from the craftsman, intense physical exertion, and substantial labour costs. Early industrial precursors included the two-handled “plier press,” used from roughly 1740 to 1900 to pinch small glass chandelier drops, stoppers, and toy plates, and the hand press, which emerged in Europe around 1780 and arrived in America by the 1810s. These early devices were generally limited to moulding solid structural elements, such as the ribbed “lemon-squeezer” bases and feet of lamps, candlesticks, and goblets. They lacked the vertical pressure and precise mechanical alignment required to form hollow items.
The modern era of mechanised pressed glass began in the United States between 1820 and 1830. On September 9, 1825, John P. Bakewell of the Pittsburgh firm Bakewell, Page & Bakewell received the first known U.S. patent for a mechanical glass press designed to manufacture furniture knobs. This device utilised a lever-operated plunger to force a blob of molten glass into a multi-part metal mould, shaping the interior of the article with the plunger while the mould defined the exterior patterns.
Innovation quickly spread across the American glass industry. In 1826, Henry Whitney and Enoch Robinson of the New England Glass Company in Cambridge, Massachusetts, secured a pressing-related patent, followed in 1827 by the development of the first full-size machine press capable of producing large hollowware. Concurrently, Deming Jarves, who founded the Boston and Sandwich Glass Company in 1825, became one of the industry’s most prolific champions, refining pressing mechanics and perfecting intricate mould designs. In 1828, Phineas C. Dummer, George Dummer, and James Maxwell of the Jersey City Glass Works secured additional patents for advanced mould structures. A critical refinement arrived in 1830 with the introduction of the “cap ring”—a metal collar that sat atop the mould assembly to ensure uniform edge thickness, preventing glass from escaping the mould margins even when the volume of the glass gather varied slightly.
The standard mechanical pressing sequence drastically restructured the glasshouse floor. It replaced a highly paid, traditional team of three or four skilled glassblowers with two semi-skilled operators: a “gatherer,” who collected a precise portion of molten glass on a gathering iron and dropped it into a preheated mould, and a “presser,” who sheared the glass gather and lowered the fixed-lever mechanism. A third worker, often a young assistant or “boy,” carried the finished item to an annealing oven or kiln, where it cooled gradually over hours to relieve internal structural stresses. This operational shift dramatically accelerated production speeds, allowing two workers to produce four times as much glassware as a traditional blowing team, lowering prices, and setting the stage for industrial mass production by the 1840s.
The Transatlantic Migration and the Burden of the Excise Tax
The efficiency of the American pressing method quickly attracted international attention, and the technique migrated across the Atlantic to European centres—notably France, Bohemia, and Sweden—during the 1830s. However, the adoption of mechanical pressing in the United Kingdom was severely stifled by the Glass Excise Act. This regulatory framework levied heavy fiscal duties based on the weight of raw molten glass produced. Because pressed glass pieces required thicker walls and heavier bases to survive the extreme mechanical pressure applied by the plunger, they were penalised under this tax regime, making them far more costly to manufacture than delicate, thin-walled blown glass. Consequently, early British manufacturers chose to focus their efforts on high-end cut and engraved crystal, while common utilitarian tableware was largely imported from Ireland, which remained exempt from the weight-based excise tax.
Despite these fiscal barriers, the machine press established a foothold in Britain. In the 1830s, Benjamin Richardson, then manager at T. Hawkes & Co. in Dudley, West Midlands, successfully installed the first pressing machine in England. Progress remained sluggish until 1835, when the repeal of the domestic salt tax triggered a demand for tabletop salt cellars. British glasshouses began churning out pressed glass salt cellars in vast configurations. In 1831, Apsley Pellatt, the innovative proprietor of the Falcon Glass Works in London, secured Patent No. 6091 for an improved mode of forming glass vessels, advancing pressing tech. In the West Midlands, firms like George Bacchus & Sons (originally Bacchus & Green) in Birmingham began using plungers and cast-iron moulds to manufacture robust consumer wares.
The real turning point for British pressed glass occurred in 1845 with the total repeal of the glass tax. Relieved of the weight-based financial burden, English production expanded at a spectacular rate. For a golden window between 1840 and 1870, companies in the Midlands, including Hawkes, Rice Harris, Bacchus & Green, and Guest, refined their machinery to mass-produce cheap pressed tableware that closely mimicked traditional Georgian cut glass. Simultaneously, glassworks sprung up in the Manchester area, such as Percival Vickers, Molineaux and Webb, and Derbyshire, which maintained highly successful lines by pairing innovative designs with the brilliant clarity of lead crystal.
The Chemical Evolution: Flint Glass to Soda-Lime Formula
The commercial trajectory of pressed glass was fundamentally bound to the refinement of glass chemistry. Throughout the early to mid-nineteenth century, premium pressed glass was made using “flint glass” or lead crystal, a formula relying on a high proportion of lead oxide (at least 20% to 35% by weight) mixed into a potash-silica base. The high density of lead imparted a remarkable refractive index, lending the glassware a brilliant, prismatic “sparkle” and a sonorous bell-like ring when tapped. From a manufacturing standpoint, lead oxide drastically reduced the viscosity and working temperature of the molten metal, allowing it to flow fluidly into the fine details of an engraved mould under minimal physical force. However, the high cost of lead ore and its immense weight kept lead glass relatively expensive, limiting its accessibility among working-class families.
A chemical breakthrough occurred in December 1864 in Wheeling, West Virginia. William Leighton Sr., a chemist at the J.H. Hobbs, Brockunier and Company glassworks, formulated a non-lead “lime glass” recipe. By substituting cheap bicarbonate of soda for expensive soda ash and using lime as a structural stabiliser, Leighton produced a glass that matched the clarity and brilliance of flint glass but was substantially lighter and cheaper. Crucially, this new soda-lime compound cooled and hardened far more rapidly than lead glass. While this required the glasshouse workforce to shape and press the molten glass much faster, it greatly curtailed production cycle times and slashed labor expenses. This formulation swept through the American glass industry, rapidly displacing lead recipes at almost all factories specialising in consumer tableware.
A parallel chemical evolution transformed the British industry. Glassmakers in the Northeast of England discovered that compounding a semi-lead glass with soda potash yielded a material that was highly durable, perfectly suited for mechanical pressing, and remarkably economical. This sparked an industrial boom along the River Tyne and River Wear (Tyneside and Wearside), turning Gateshead and Sunderland into the primary hubs of affordable British pressed glass. Names like Sowerby’s Ellison Glass Works, Davidson’s Teams Glass Works, Henry Greener, and Edward Moore became globally synonymous with mass-produced tableware. These Northeast firms capitalised on low-cost materials to secure a massive domestic and export market.
This chemical transformation coincided with a major macroeconomic geographic shift. In the United States, as local timber supplies on the East Coast were depleted and the demand for high-volume production soared, factories migrated westward to tap into the dense coal fields of western Pennsylvania, West Virginia, and Ohio. This movement accelerated during the 1880s with the discovery of cheap, abundant natural gas reservoirs in Northwest Ohio and East Central Indiana, which sparked a regional gas boom. By 1920, the tri-state area of western Pennsylvania, eastern Ohio, and the West Virginia panhandle was home to 80% of all glass manufacturing in the United States, leaving the old coastal factories completely behind.
Stylistic Eras: From Lacy Glass to Early American Pattern Glass (EAPG)
The visual language of pressed glass evolved through several clear stylistic periods dictated by mechanical progress. During the earliest years of mass production (1825–1850), the contact between high-temperature molten glass and the significantly cooler faces of the metal moulds generated tiny surface wrinkles known as “chill marks,” alongside rough scars from the shears used to sever the gather. To obscure these technical blemishes, designers developed the “Lacy Glass” style. Moulds were meticulously hand-carved with dense, intricate scrollwork, geometric motifs, and net-like backgrounds composed of tiny raised dots called stipples. This fine stippling acted as a brilliant canvas that refracted light throughout the vessel, cleverly drawing the human eye away from surface irregularities. The Boston & Sandwich Glass Company excelled in this style, producing elegant lacy novelties, master salts, and “cup plates”—small glass coasters used to rest teacups when it was fashionable to drink hot tea directly from a wide saucer.
By the late 1840s, advancements in mould metallurgy and tighter temperature controls enabled factories to eliminate chill marks entirely. This ushered in the “Colonial Age” (1845–1865), which abandoned dense stippling in favour of heavy, plain, and smooth geometric surfaces characterised by broad vertical panels, flutes, and scalloped edges. This simpler look directly mimicked the high-end Anglo-Irish cut crystal favoured by wealthy households.
Following the American Civil War, the industry entered the “Naturalistic Era” (1865–1880s). Designs shifted dramatically toward folk-art-inspired, naturalistic compositions featuring deep relief engravings of animals, foliage, fruits, and historic commemorative motifs celebrating the 1876 Centennial. Wares were frequently embellished with decorative techniques like acid etching, sandblasting, and chemical frosting.
By the 1880s, production reached its zenith, entering the “Golden Age of Pressed Glass,” also known as the Early American Pattern Glass (EAPG) era. Manufacturers began producing vast, unified tableware lines comprising hundreds of matching components in over 3,000 distinct patterns. Coordinated “table sets” became a strict social requirement for the rising middle class. To fuel consumer appetite for matching sets, factories introduced highly specialised items such as celery vases, honey dishes, marmalade jars, molasses cans, and a myriad of specialised drinking glasses. Because pressed glass was so affordable, ordinary families could practice “conspicuous consumption,” setting tables with dozens of uniform, matching pieces that successfully projected an illusion of luxury. It was during this era that coloured pressed glass came heavily into vogue, with huge quantities sold in dime stores or distributed as free premiums inside commercial packages of oatmeal, soap, and baking flour.
Iridescent Ware, Novelties, and Global Friction
At the dawn of the twentieth century, manufacturers sought novel stylistic variations to revitalise the highly competitive consumer market. In late 1907, the Fenton Art Glass Company commercialised an iridescent pressed glass style under the trade name “Iridescent Ware,” which collectors quickly termed “Carnival Glass.” The Harry Northwood Company followed suit in 1908, becoming a dominant force in its production. The process involved taking a hot, freshly pressed piece of glass and spraying its surface with a solution of metallic salts—such as tin or uranium compounds—before subjecting it to a final firing in a kiln. This treatment resulted in a shimmering, rainbow-like opalescent sheen that perfectly mimicked expensive, hand-wrought Art Nouveau art glass at a fraction of the cost. Concurrently, “Goofus Glass” emerged as a cheaper alternative in the 1910s, involving the direct application of cold, unfired oil paints and gold enamels over moulded floral bases. While visually striking, the lack of a firing process made Goofus paint highly vulnerable to chipping and wear over time.
This massive scale of production was constantly tempered by industrial friction and changing labour dynamics. Glassmaking was one of the earliest industries to organise, giving rise to powerful trade unions like the American Flint Glass Workers’ Union (1878) and the Glass Bottle Blowers Association. In England, conflict over piece-work wage rates, speed of working, and apprentice limitations culminated in the great industrial lock-out of 1857–1859, which temporarily paralysed production. By the late 1880s, trade unions held a high degree of control over the manufacturing sequence; for instance, the Pressed Glass Makers’ Friendly Society of Great Britain established rigid pricing committees that evaluated every new metal mould introduced, directly dictating the piece-work wage rate and restricting the total volume of glass a worker could produce in an eight-hour shift to prevent overproduction.
This structural friction made home industries highly vulnerable to intense foreign competition. By the 1890s, cheap pressed glass and blown tumblers manufactured under lower wage conditions in continental Europe (Germany, Belgium, France, and Bohemia) flooded British and American domestic markets. To combat these lower foreign manufacturing costs, firms like Sowerby’s went so far as to temporarily export their physical iron moulds to Germany in 1891, manufacturing pieces abroad for re-importation into the UK market.
The Automation Revolution and the Shift to Functionalism (1900–1920)
The final chapter in the historical arc of traditional pressed glass was defined by total mechanical automation. The most disruptive technological innovation in the history of glassmaking occurred in 1899 when Michael J. Owens developed an automatic bottle-blowing machine, which was fully commercialised in 1903 under the financial backing of Edward Libbey and the newly created Owens Bottle Machine Company. Operating on a revolutionary vacuum suction method, the Owens machine dipped its mechanical arms directly into a revolving tank furnace, automatically sucking up a measured portion of glass, blowing the form, and ejecting a finished bottle in mere seconds. Capable of cranking out up to 250 highly standardised bottles per minute, this automation completely eliminated the need for human gatherers and pressers. It permanently transformed the glasshouse from a labor-intensive, skilled craft environment into a highly mechanised engineering activity, successfully abolishing the widespread exploitation of child labour (“mould boys”) in glass plants.
This leap in productivity was supported by the transition from old clay melting pots to continuous tank furnaces. First successfully operational in the United States in 1880 at Poughkeepsie, New York, continuous tanks allowed raw ingredients to be constantly fed into one end while molten glass was continuously drawn from the other, permitting non-stop, 24-hour factory operations. Concurrently, long conveyor-fed ovens called continuous lehrs replaced old intermittent kilns, allowing thousands of pressed pieces to cool uniformly while moving steadily toward packing rooms.
The massive capital requirements necessary to install continuous tanks and automated machinery sparked a wave of industrial consolidation. Severe economic depressions in the 1890s forced dozens of independent, family-owned glass houses into bankruptcy. Survivors preserved their tangible assets by merging into massive corporate combines, most notably the United States Glass Company trust (1891), which absorbed over a dozen major Ohio Valley plants (including the Hobbs factory), and the National Glass Company combine (1899). These trusts deliberately leveraged their pooled capital to oppose union resistance and systematically introduce automated pressing equipment, phasing out the complicated, handmade novelty lines that required expensive, highly skilled labor.
By 1910, the Victorian era had drawn to a close, and with it, the consumer demand for intricate, fussy pattern sets collapsed. The market underwent a profound aesthetic pivot toward modern functionalism and early Art Deco design principles. Glassware manufactured between 1910 and 1920 rapidly stripped away its Victorian embellishments, embracing clean, streamlined geometric forms and bold, solid transparent colours such as “Flamingo” pink and “Moongleam” green. A notable example was A.H. Heisey’s popular “Greek Key” pattern, which blended flat structural panels with a minimalist classical motif.
By 1920, the traditional era of Early American Pattern Glass was completely over, replaced by fully automated, utilitarian glassware lines. This foundational setup of continuous tanks, soda-lime chemistry, and automated iron moulds would serve as the exact bedrock for the mass production of “Depression Glass” in the 1930s, using the machines of the machine age to provide cheap comfort to a nation in economic crisis.