Hornsby محله ایرانی نشین هورنزبی در سیدنی
Hornsby محله ایرانی نشین هورنزبی در سیدنی
The Hornsby Water Clock, titled Man, Time and the Environment is a piece of kinetic sculpture, a decorative fountain and a functional clock in the Florence Street pedestrian mall in Hornsby, New South Wales, Australia. Unveiled in 1993, the sculpture was designed and engineered by Victor Cusack and constructed of bronze, stainless steel and glass by Victor and his foundry floor manager Rex Feakes. Construction, including alterations to the mall, cost over A$1 million and took two and half years; thereafter, chicken bones and other carelessly discarded items caused many breakdowns before the water filtration system was upgraded.
Thought by some to have actually been at Hornsby much longer than when it was unveiled in 1993, it is a combination of three water-powered clocks – a 4th-century BC Greek clepsydra, an 11th-century Chinese water wheel clock and a 17th-century Swiss pendulum clock – plus a 17-note bronze carillon to ring the hour based on a 250-year-old design found in an old English church. The whole assembly is mounted on a floating pontoon that rotates every 12 hours giving a fourth time indicator as a pointer sweeps past Roman numerals placed in the water around the fountain's perimeter.
The sculpture is approximately 8 metres (26 ft) tall and weighs 20 tonnes (22 short tons).
The clock is adorned with four plaques, three of which explain the operation of the three individual clocks in the overall structure, and one explaining the clock's purpose overall.
This first plaque says, "This mobile water sculpture is a unique environmental statement, particular relevant to Hornsby, an area retaining extensive unspoilt natural areas with abundant land and marine based flora and fauna. Its symbolism is contrasting man's historically joyful creativity with his rapidly increasing inability to co-exist with virtually all forms of life on earth."
It goes on to suggest there is a "polarity" between the "joyful complexity of creation" shown in the mechanisms mankind has invented such as those on display and the destruction we are causing by the rapidly rising global population. It pays "tribute" to the beauty of the environment in the area and our need to be responsible to our "fellow animals (human and otherwise)".
Animals represented in the sculpture are the:
Tawny frogmouth
Rainbow lorikeet
Pied cormorant
Little penguin
Australian pelican
Australian water dragon
Blue-tongued lizard
Goanna
Grey-headed flying fox
Brushtail possum
Sea eagle
Human
Greek clepsydra clock
In this type of clock, water is run into a stationary vessel from a tank which is kept meniscus-full meaning that water rises over the top edge of the tank forming a convex meniscus and excess water is drained away. Since the depth of the water in the supply tank is constant, water is released at a constant rate; the depth of water in the receiving vessel is a measure of time.
In this example, two tubes on bearings are arranged so that they overbalance when full, thereby dumping their contents into the pond and returning to vertical under the influence of a counterweight at which point the cycle starts over. The counterweight is in the shape of a ram's head, while the top of each tube is decorated with the head of a Hermaphrodite.
Chinese water wheel clock
This clock uses 20 counterweighted buckets that are free to swing and are mounted around the edge of a wheel 2.3 metres (7.5 ft) in diameter. Water supplied from a meniscus-full tank runs into a bucket at a constant rate until the weight of water in the bucket is sufficient to overcome the counterweight (see the Chinese Buddha sculpture) allowing the bucket to tip over spilling its contents. As it falls, it trips a lever connected by a cable to a catch on top of the water wheel which is released to allow the wheel to rotate. However, by the time it has moved on, the catch has returned to its position locking the wheel in place so that the next empty bucket is now under the water flow to repeat the cycle.
Swiss pendulum clock
It is claimed that this is "undoubtedly the largest water-driven pendulum clock ever built" and has the same 4 second pendulum cycle time as the Great Clock of Westminster (often erroneously known as "Big Ben"), though the pendulum weight is heavier at 350 kg (770 lb). The design is based on one drawn up by Claude Perrault in 1669 but never built.
Pontoon rotation clock
The complete sculpture is rotated by the water underneath it swirling in a clockwise direction when viewed from above. The rate at which it turns is regulated by a "catch" device on the pontoon edge that locks into one of the 60 stops secured to the wall of the inner pond. Every 12 minutes the catch is released by a mechanism linked the pendulum clock allowing the pontoon to rotate until the next stop is reached
The Hornsby Water Clock, titled Man, Time and the Environment is a piece of kinetic sculpture, a decorative fountain and a functional clock in the Florence Street pedestrian mall in Hornsby, New South Wales, Australia. Unveiled in 1993, the sculpture was designed and engineered by Victor Cusack and constructed of bronze, stainless steel and glass by Victor and his foundry floor manager Rex Feakes. Construction, including alterations to the mall, cost over A$1 million and took two and half years; thereafter, chicken bones and other carelessly discarded items caused many breakdowns before the water filtration system was upgraded.
Thought by some to have actually been at Hornsby much longer than when it was unveiled in 1993, it is a combination of three water-powered clocks – a 4th-century BC Greek clepsydra, an 11th-century Chinese water wheel clock and a 17th-century Swiss pendulum clock – plus a 17-note bronze carillon to ring the hour based on a 250-year-old design found in an old English church. The whole assembly is mounted on a floating pontoon that rotates every 12 hours giving a fourth time indicator as a pointer sweeps past Roman numerals placed in the water around the fountain's perimeter.
The sculpture is approximately 8 metres (26 ft) tall and weighs 20 tonnes (22 short tons).
The clock is adorned with four plaques, three of which explain the operation of the three individual clocks in the overall structure, and one explaining the clock's purpose overall.
This first plaque says, "This mobile water sculpture is a unique environmental statement, particular relevant to Hornsby, an area retaining extensive unspoilt natural areas with abundant land and marine based flora and fauna. Its symbolism is contrasting man's historically joyful creativity with his rapidly increasing inability to co-exist with virtually all forms of life on earth."
It goes on to suggest there is a "polarity" between the "joyful complexity of creation" shown in the mechanisms mankind has invented such as those on display and the destruction we are causing by the rapidly rising global population. It pays "tribute" to the beauty of the environment in the area and our need to be responsible to our "fellow animals (human and otherwise)".
Animals represented in the sculpture are the:
Tawny frogmouth
Rainbow lorikeet
Pied cormorant
Little penguin
Australian pelican
Australian water dragon
Blue-tongued lizard
Goanna
Grey-headed flying fox
Brushtail possum
Sea eagle
Human
Greek clepsydra clock
In this type of clock, water is run into a stationary vessel from a tank which is kept meniscus-full meaning that water rises over the top edge of the tank forming a convex meniscus and excess water is drained away. Since the depth of the water in the supply tank is constant, water is released at a constant rate; the depth of water in the receiving vessel is a measure of time.
In this example, two tubes on bearings are arranged so that they overbalance when full, thereby dumping their contents into the pond and returning to vertical under the influence of a counterweight at which point the cycle starts over. The counterweight is in the shape of a ram's head, while the top of each tube is decorated with the head of a Hermaphrodite.
Chinese water wheel clock
This clock uses 20 counterweighted buckets that are free to swing and are mounted around the edge of a wheel 2.3 metres (7.5 ft) in diameter. Water supplied from a meniscus-full tank runs into a bucket at a constant rate until the weight of water in the bucket is sufficient to overcome the counterweight (see the Chinese Buddha sculpture) allowing the bucket to tip over spilling its contents. As it falls, it trips a lever connected by a cable to a catch on top of the water wheel which is released to allow the wheel to rotate. However, by the time it has moved on, the catch has returned to its position locking the wheel in place so that the next empty bucket is now under the water flow to repeat the cycle.
Swiss pendulum clock
It is claimed that this is "undoubtedly the largest water-driven pendulum clock ever built" and has the same 4 second pendulum cycle time as the Great Clock of Westminster (often erroneously known as "Big Ben"), though the pendulum weight is heavier at 350 kg (770 lb). The design is based on one drawn up by Claude Perrault in 1669 but never built.
Pontoon rotation clock
The complete sculpture is rotated by the water underneath it swirling in a clockwise direction when viewed from above. The rate at which it turns is regulated by a "catch" device on the pontoon edge that locks into one of the 60 stops secured to the wall of the inner pond. Every 12 minutes the catch is released by a mechanism linked the pendulum clock allowing the pontoon to rotate until the next stop is reached
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