The Glassmakers Home   Gallery   Contact   Events & Projects   Projects: 2019 On   Film & TV   Archive & Links Quarley 2020 Furnace

2020 Furnace and Lehr at Quarley - Firing Five - Glassblowing

Projects: 2019 Onwards   Shelter Build   Wood Gathering and Processing   General Preparation   Firepit Construction

Furnace Installation   Lehr Installation   Floodproofing   Firings One and Two   Firing Three   Firing Four   Firing Five   Firing Six

------------------------------------------------

Furnace Performance and Lehr   Pots and Breakages   Glassblowing

On this page we have included a couple of extra items (the last two on the page). The first one is a series of photos showing an experimental method of puntying: the Clay Punty technique. The second one is a method for making a short, bicoloured rectangular cane with a spiralled cross-section. We use these cross-sections for reproducing Roman ribbed bowls with this pattern. See this page on our archived 'Roman Glassmakers' website for more information on ribbed bowls.

Glassblowing

Apothecary Bottle

Another series of photos showing this type of bottle being made.

View these close-ups alongside the photos showing this bottle type being made on this page from Firing Four.

Apothecary Bottle: flattening the base
Apothecary Bottle: cracking off Apothecary Bottle: cracked off
Apothecary Bottle: attaching the punty Apothecary Bottle: reheating
Apothecary Bottle: gathering the string ring Apothecary Bottle: the glass for the string ring
Apothecary Bottle: starting the string ring trail Apothecary Bottle: trailing the string ring
Apothecary Bottle: shaping the string ring Apothecary Bottle: shaping the neck and lip
Apothecary Bottle: preparing to knock off Apothecary Bottle: knocking off
Apothecary Bottle: into the lehr Apothecary Bottle: safely in the lehr
Conical Phial

The body is made from a small elongated bubble. After puntying and rehesting, the neck and rim are shaped by cutting in and flaring at the top of the body

Conical Phial: finishing the base
Conical Phial: cracking off Conical Phial: attaching the punty
Conical Phial: reheating Conical Phial: centering and straightening
Conical Phial: starting the neck Conical Phial: forming the neck
Conical Phial: forming the neck Conical Phial: knocking off
Storage Jar

Making this jar is very similar to making the Storage Jar in Firing Four, but without the decoration. The rim is also folded three times: once inwards and twice outwards, but the third fold is taken further until it is horizantal, not vertical.

See this page for a similar jar made during Firing Four.

See this page for a similar jar made during Phoenix Firing Two.

Note the use of the floor marver to cool the base, keeping it thicker than the walls of the jar.

Storage Jar: using the floor marver to cool the base whilst blowing
Storage Jar: using the floor marver to cool the base whilst blowing Storage Jar: attaching the punty
Storage Jar: reheating Storage Jar: reheating the rim
Storage Jar: starting the second fold Storage Jar: the second fold is completed
Storage Jar: starting the third fold Storage Jar: reheating the rim
Storage Jar: finishing the third fold Storage Jar: preparing to knock off
Square Bottle

The mould is made from four sections of a ceramic kiln batt cut to shape and clamped together with two wooden backing plates held in place with bolts and wingnuts. It is held to the base with a removeable metal clamp which can be slackened to change the base mould for others of different patterns.

Attaching a handle: The gather is shaped and flattened on the marver which allows a wide lower attachment. It is tucked under the rim and the bit iron is cast off. after reheating and shaping, it is ready to be put into the lehr.

Square Bottle: the mould
Square Bottle: gathering the handle Square Bottle: shaping the handle gather by flattening it on the marver
Square Bottle: lower attachment Square Bottle: upper attachment
Square Bottle: casting off the handle Square Bottle: reheating
Square Bottle: shaping the handle Square Bottle: shaping the handle
Square Bottle: shaping the handle Square Bottle: shaping the handle
Square Bottle: a critical appraisal! Square Bottle: preparing to knock off
Square Bottle: knocking off Square Bottle: into the lehr
Festooned Bottle

Adding the festoons: The white trail has to be of a glass composition that works at a higher temperature than the glass forming the body. If not, it will bleed into the body glass, lose its definition, and will expand too much when blown.

The trail is formed before the glass is blown as it needs several reheats to achieve the pattern, and each drag of the knife or hook will distort the glass and pull it off-centre.

Two festoons opposite each other are initially worked, then the two at right angles to the first pair, reheating and alternating to form the final festoons.

The glass is reheated and reshaped before blowing.

Festooned Bottle: using a knife to make the festoons
Festooned Bottle: using a knife to make the festoons Festooned Bottle: using a knife to make the festoons
Festooned Bottle: shaping the gather before blowing Festooned Bottle: shaping the gather before blowing
Festooned Bottle: starting to blow the bubble Festooned Bottle: using the marver to cool the base whilst blowing
An Experiment

The Clay Punty

The clay punty was an idea we came up with in the early 2000s, and is a way of attaching a small blown vessel to a punty rod without using glass. It does not leave a mark or scar, so is a suitable method for the simple, small early Roman blown vessels.

These first attempts were largely successful, even though we were using a modern glory hole with a large opening which meant that heat radiation was a problem. We were also using vessels with much longer necks than the ones we use here. We left the completed vessels to cool naturally, then reannealed them.

For this experiment, we made a collar with a 2" opening and proceeded as in the photographs: attaching wet clay to the punty disc, adding a small vessel, centering it and shaping the clay around its lower half, then introducing the vessel rim to the heat source.

Although the process worked, the heat dried the clay, which meant that the vessel could work loose. To combat this, we will make other collars with smaller openings, and will experiment with directing the heat in such a way as to heat the rim of the vessel without drying the clay.

Clay Punty: some of the bottles used Clay Punty: the metal disc on the end of the bit iron
Clay Punty: attaching the clay to the disc Clay Punty: centering the clay
Clay Punty: attaching the vessel Clay Punty: centering the vessel
Clay Punty: cleaning the vessel Clay Punty: heating the lip
Clay Punty:  heating the lip Clay Punty:  heating the lip
Clay Punty: opening the lip Clay Punty: heating the lip
Clay Punty: opening the lip Clay Punty: heating the lip
Clay Punty: opening the lip - this time using a wooden stick Clay Punty: attaching a date flask
Clay Punty: heating the lip Clay Punty: opening the lip
A Non-blowing Technique

Making a Cane with a Spiral Cross-section

This is begun by gathering some of the base glass - in this case, purple, and flattening, shaping and bending it to form a tongue. When cool, it is lowered onto the opaque white glass, collecting some on the bottom of the tongue without forming any bubbles, lifting it out and scraping the white glass on the rim of the pot to remove excess glass.

It was difficult to do this as the pot was set at an angle, so, in this case, the excess white glass was removed using the pincers.

After stretching it, the tongue is rolled up using the marver. In order to apply pressure when rolling, only a couple of inches of the tongue is reheated each time.

When fully rolled up, the spiral is removed from the bit iron and the moile is reheated to act as a punty.

After reheating, marvering and stretching a little, the spiral is flattened to form a rectangle in cross section.

Several reheats and stretches later, it is ready to be removed from the bit iron and transferred to the annealing oven.

When cold, the cane can be sliced into short 'florets' using a hammer and hardy. Photographs of some of these florets, along with illustrations and explanations of how they are used, can be seen on this page.

Spiral Cane: the gather for the tongue Spiral Cane: making the tongue
Spiral Cane: the tongue Spiral Cane: angling the tongue
Spiral Cane: gathering the opaque white glass Spiral Cane: removing the excess
Spiral Cane: removing the excess Spiral Cane: heating the tongue
Spiral Cane: heating the tongue Spiral Cane: stretching the tongue
Spiral Cane: the stretched tongue Spiral Cane: heating the tip
Spiral Cane: flattening the tip Spiral Cane: starting the rollup
Spiral Cane: rolling up the tongue Spiral Cane: rolling up the tongue
Spiral Cane: rolling up the tongue Spiral Cane: rolling up the tongue
Spiral Cane: the rolled-up tongue Spiral Cane: creating a weak area (this type of shears was not used by the Romans but it is a quick way to make the weak spot)
Spiral Cane: the cracked-off spiral Spiral Cane: reheating the moile
Spiral Cane: picking up the spiral Spiral Cane: reheating the spiral
Spiral Cane: marvering the spiral Spiral Cane: reheating the spiral
Spiral Cane: marvering the spiral Spiral Cane: giving the spiral a rectangular cross-section
Spiral Cane: giving the spiral a rectangular cross-section Spiral Cane: giving the spiral a rectangular cross-section
Spiral Cane: stretching the spiral Spiral Cane: stretching the spiral
Spiral Cane: straightening the spiral Spiral Cane: making a weak point
Spiral Cane: cracking off Spiral Cane: cross-sections of two canes

Home   Gallery   Contact   Events & Projects   Projects: 2019 Onwards   Film & TV   Archive & Links