Ancient Roman technology is the collection of techniques, skills, methods, processes, and engineering practices which supported Roman civilization and made possible the expansion of the economy and military of ancient Rome (753 BC – 476 AD).
The Roman Empire was one of the most technologically advanced civilizations of antiquity, with some of the more advanced concepts and inventions forgotten during the turbulent eras of Late Antiquity and the early Middle Ages. Gradually, some of the technological feats of the Romans were rediscovered and/or improved upon during the Middle Ages and the beginning of the Modern Era; with some in areas such as civil engineering, construction materials, transport technology, and certain inventions such as the mechanical reaper, not improved upon until the 19th century. The Romans achieved high levels of technology in large part because they borrowed technologies from the Greeks, Etruscans, Celts, and others.
With limited sources of power, the Romans managed to build impressive structures, some of which survive to this day. The durability of Roman structures, such as roads, dams, and buildings, is accounted for in the building techniques and practices they utilized in their construction projects. Rome and its surrounding area contained various types of volcanic materials, which Romans experimented with in the creation of building materials, particularly cements and mortars. Along with concrete, the Romans used stone, wood, and marble as building materials. They used these materials to construct civil engineering projects for their cities and transportation devices for land and sea travel.
Warfare was an essential aspect of Roman society and culture. The military was not only used for territorial acquisition and defense, but also as a tool for civilian administrators to use to help staff provincial governments and assist in construction projects. The Romans adopted, improved, and developed military technologies for foot soldiers, cavalry, and siege weapons for land and sea environments.
In addition to military engineering, the Romans also made significant contributions to medical technologies.10 Innovations That Built Ancient Rome
Types of power
Human power The most readily available power sources to the ancients were human and animal. Mechanical devices were developed to assist in the manipulation of objects which exceeded human strengthone such device being the windlass, which used ropes and pulleys to manipulate objects. The device was powered by multiple people pushing or pulling on handspikes attached to a cylinder.
Human power was also a factor in the movement of ships, particularly warships. Though wind-powered sails were the dominant form of power in water transportation, rowing was often used by military craft during battle engagements.
Animal power The primary usage of animal power was for transportation. Several species of animals were used for differing tasks. Being strong and cheap to maintain, oxen were used to farm and transport large masses of goods. If speed was desired, horses were utilized. The main environment which called for speed was the battlefield, with horses being used in the cavalry and scouting parties. For carriages carrying passengers or light materials donkeys or mules were generally used, as they were faster than oxen and cheaper on fodder than horses. Other than being used as a means of transportation, animals were also employed in the operation of rotary mills. Beyond the confines of the land, a schematic for a ship propelled by animals has been discovered. The work known as De rebus bellicis describes a ship powered by oxen. In this design oxen are attached to a rotary, moving in a circle on a deck floor, spinning two paddle wheels, one on either side of the ship. The likelihood that such a ship was ever built is low, due to the impracticality of controlling animals on a watercraft.
Water power
Power from water was generated through the use of a water wheel. A water wheel had two general designs: the undershot and the overshot. The undershot water wheel generated power from the natural flow of a running water source pushing upon the wheel's submerged paddles. The overshot water wheel generated power by having water flow over its buckets from above. This was usually achieved by building an aqueduct above the wheel. Although it is possible to make the overshot water wheel 70 percent more efficient than the undershot, the undershot was generally the preferred water wheel. The reason being the economic cost of building an aqueduct was too high for the mild benefit of having the water wheel turn faster. The primary purpose of water wheels was to generate power for milling operations and to raise water above a system's natural height. Evidence also exists that water wheels were used to power saws, though only scant descriptions of such devices remain.
Wind power Wind power was used in the operation of watercraft, through the use of sails. Windmills do not appear to have been created in ancient times.
Solar power The Romans used the Sun as a passive solar heat source for buildings, such as bath houses. Thermae were built with large windows facing southwest, the location of the Sun at the hottest time of day.
Theoretical types of power
Steam power
The generation of power through steam remained theoretical in the Roman world. Hero of Alexandria published schematics of a steam device that rotated a ball on a pivot. The device used heat from a cauldron to push steam through a system of tubes towards the ball. The device produced roughly 1500 rpm but would never be practical on an industrial scale as the labour requirements to operate, fuel and maintain the heat of the device would have come at too great a cost.
Technology as a craft Roman technology was largely based on a system of art and crafts. Technical skills and knowledge were contained within the particular trade, such as stonemasons. In this sense, knowledge was generally passed down from a tradesman master to a tradesman apprentice. Since there are only a few sources from which to draw upon for technical information, it is theorized that tradesmen kept their knowledge a secret. Vitruvius, Pliny the Elder and Frontinus are among the few writers who have published technical information about Roman technology. There was a corpus of manuals on basic mathematics and science such as the many books by Archimedes, Ctesibius, Heron (a.k.a. Hero of Alexandria), Euclid and so on. Not all of the manuals which were available to the Romans have survived, as lost works illustrate.
Engineering and construction
Building materials and instruments
Wood The Romans created fireproof wood by coating the wood with alum.
Stone It was ideal to mine stones from quarries that were situated as close to the site of construction as possible, to reduce the cost of transportation. Stone blocks were formed in quarries by punching holes in lines at the desired lengths and widths. Then, wooden wedges were hammered into the holes. The holes were then filled with water so that the wedges would swell with enough force to cut the stone block out of the Earth. Blocks with the dimensions of have been found, weighing about 1000 tons. There is evidence that saws were developed to cut stone in the Imperial age. Initially, Romans used saws powered by hand to cut stone, but later went on to develop stone cutting saws powered by water.
Cements The mixture ratio of Roman lime mortars depended upon where the sand for the mixture was acquired. For sand gathered at a river or sea, the mixture ratio was two parts sand, one part lime, and one part powdered shells. For sand gathered further inland, the mixture was three parts sand and one part lime. The lime for mortars was prepared in limekilns, which were underground pits designed to block out the wind.
Another type of Roman mortar is known as pozzolana mortar. Pozzolana is a volcanic clay substance located in and around Naples. The mixture ratio for the cement was two parts pozzolana and one part lime mortar. Due to its composition, pozzolana cement was able to form in water and has been found to be as hard as natural forming rock.
Cranes
Cranes were used for construction work and possibly to load and unload ships at their ports, although for the latter use there is according to the "present state of knowledge" still no evidence.Michael Matheus: "Mittelalterliche Hafenkräne," in: Uta Lindgren (ed.): Europäische Technik im Mittelalter. 800–1400, Berlin 2001 (4th ed.), pp. 345–348 (345) Most cranes were capable of lifting about 6–7 tons of cargo, and according to a relief shown on Trajan's Column were worked by treadwheel.
Buildings
The Pantheon The Romans designed the Pantheon thinking about the concepts of beauty, symmetry, and perfection. The Romans incorporated these mathematical concepts into their public works projects. For instance, the concept of perfect numbers was used in the design of the Pantheon by embedding 28 coffers into the dome. A perfect number is a number where its factors add up to itself. So, the number 28 is considered to be a perfect number, because its factors of 1, 2, 4, 7, and 14 add together to equal 28. Perfect numbers are extremely rare, with there being only one number for each quantity of digits (one for single digits, double digits, triple digits, quadruple digits, etc.). Embodying mathematical concepts of beauty, symmetry, and perfection, into the structure conveys the technical sophistication of Roman engineers.
Roman concrete was essential to the design of the Pantheon. The mortar used in the construction of the dome is made up of a mixture of lime and the volcanic powder known as pozzolana. The concrete is suited for use in constructing thick walls as it does not require to be completely dry to cure.
The construction of the Pantheon was a massive undertaking, requiring large quantities of resources and man-hours. Delaine estimates the amount of total manpower needed in the construction of the Pantheon to be about 400 000 man-days.
Hagia Sophia
Although the Hagia Sophia was constructed after the fall of the Western empire, its construction incorporated the building materials and techniques of ancient Rome. The building was constructed using pozzolana mortar. Evidence for the use of the substance comes from the sagging of the structure's arches during construction, as a distinguishing feature of pozzolana mortar is the large amount of time it needs to cure. The engineers had to remove decorative walls to let the mortar cure.
The pozzolana mortar used in the construction of the Hagia Sophia does not contain volcanic ash but instead crushed brick dust. The composition of the materials used in pozzolana mortar leads to increased tensile strength. A mortar composed of mostly lime has a tensile strength of roughly whereas pozzolana mortar using crushed brick dust has a tensile strength of . The advantage of using pozzolana mortar in the construction of the Hagia Sophia is the increase in strength of the joints. The mortar joints used in the structure are wider than one would expect in a typical brick and mortar structure. The wide mortar joints suggests the designers of the Hagia Sophia knew about the high tensile strength of the mortar and incorporated it accordingly.
Waterworks
Aqueducts The Romans constructed numerous aqueducts to supply water. The city of Rome itself was supplied by eleven aqueducts made of limestone that provided the city with over one million cubic metres of water each day, sufficient for 3.5 million people even in modern times, and with a combined length of .