Episodes

  • 34 - Military technology.

    34 - Military technology.
    Mar 4 2026
    Military technology. The Roman military technology ranged from personal equipment and armament to deadly siege engines. Foot soldier. Weaponry. The pilum (javelin) was a weapon favored by legionaries and weighed approximately five pounds/2.25 kilograms. It was designed to be used only once and was destroyed upon initial use. This feature prevented the enemy from reusing spears. All soldiers carried two versions of this weapon: a primary spear and a backup. A solid block of wood in the middle of the weapon provided legionaries protection for their hands while carrying the device. According to Polybius, historians have records of "how the Romans threw their spears and then charged with swords". This tactic seemed to be common practice among Roman infantry. Armour. While heavy, intricate armour was not uncommon (cataphracts), the Romans perfected a relatively light, full torso armour made of segmented plates (lorica segmentata). This segmented armour provided good protection for vital areas but did not cover as much of the body as lorica hamata (chain mail). The lorica segmentata provided better protection, but the plate bands were expensive and difficult to produce and difficult to repair in the field. Generally, mail was cheaper, easier to produce, and simpler to maintain, was one-size-fits-all and was more comfortable to wear; thus, it remained the primary form of armour even when lorica segmentata was in use. Tactics. Testudo is a tactical military maneuver original to Rome. The tactic was implemented by having units raise their shields in order to protect themselves from enemy projectiles raining down on them. The strategy only worked if each member of the testudo protected his comrade. Commonly used during siege battles, the "sheer discipline and synchronization required to form a Testudo" was a testament to the abilities of legionnaires. Testudo, meaning tortoise in Latin, "was not the norm, but rather adopted in specific situations to deal with particular threats on the battlefield". The Greek phalanx and other Roman formations were a source of inspiration for this maneuver. Cavalry. The Roman cavalry saddle had four horns and is believed to have been copied from Celtic peoples. Siege warfare. Roman siege engines such as ballistas, scorpions and onagers were not unique, but the Romans were probably the first people to put ballistas on carts for better mobility on campaigns. On the battlefield, it is thought that they were used to pick off enemy leaders. There is one account of the use of artillery in battle from Tacitus, Histories III,23:On engaging they drove back the enemy, only to be driven back themselves, for the Vitellians had concentrated their artillery on the raised road that they might have free and open ground from which to fire; their earlier shots had been scattered and had struck the trees without injuring the enemy. A ballista of enormous size belonging to the Fifteenth legion began to do great harm to the Flavians' line with the huge stones that it hurled; and it would have caused wide destruction if it had not been for the splendid bravery of two soldiers, who, taking some shields from the dead and so disguising themselves, cut the ropes and springs of the machine. In addition to innovations in land warfare, the Romans also developed the corvus (boarding device) a movable bridge that could attach itself to an enemy ship and allow the Romans to board the enemy vessel. Developed during the First Punic War it allowed them to apply their experience in land warfare on the seas. Ballistas and onagers. While core artillery inventions were notably founded by the Greeks, Rome saw opportunity in the ability to enhance this long-range artillery. Large artillery pieces such as carroballista and onagers bombarded enemy lines, before full ground assault by infantry. The manuballista would "often be described as the most advanced two-armed torsion engine used by the Roman Army". The weapon often looks like a mounted crossbow capable of shooting projectiles. Similarly, the onager, "named after the wild ass because of its 'kick'", was a larger weapon that was capable of hurling large projectiles at walls or forts. Both were very capable machines of war and were put to use by the Roman military. The Helepolis. The helepolis was a vehicle used to besiege cities. The vehicle had wooden walls to shield soldiers as they were transported toward the enemy's walls. Upon reaching the walls, the soldiers would disembark at the top of the 15 m tall structure and drop on to the enemy's ramparts. To be effective in combat, the helepolis was designed to be self-propelled. The self-propelled vehicles were operated using two types of motors: an internal motor powered by humans, or a counterweight motor powered by gravity. The human-powered motor used a system of ropes that connected the axles to a capstan. It has been calculated that at least 30 men would be required to turn the ...
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    8 mins
  • 33 - Transportation.

    33 - Transportation.
    Mar 4 2026
    Transportation.
    Roads.
    The Romans primarily built roads for their military. Their economic importance was probably also significant, although wagon traffic was often banned from the roads to preserve their military value. In total, more than 400,000 kilometres (250,000 mi) of roads were constructed, 80,500 kilometres (50,000 mi) of which were stone-paved.
    Way stations providing refreshments were maintained by the government at regular intervals along the roads. A separate system of changing stations for official and private couriers was also maintained. This allowed a dispatch to travel a maximum of 800 kilometres (500 mi) in 24 hours by using a relay of horses.
    The roads were constructed by digging a pit along the length of the intended course, often to bedrock. The pit was first filled with rocks, gravel or sand and then a layer of concrete. Finally, they were paved with polygonal rock slabs. Roman roads are considered the most advanced roads built until the early 19th century. Bridges were constructed over waterways. The roads were resistant to floods and other environmental hazards. After the fall of the Roman Empire the roads were still usable and used for more than 1000 years.
    Most Roman cities were shaped like a square. There were 4 main roads leading to the center of the city, or forum. They formed a cross shape, and each point on the edge of the cross was a gateway into the city. Connecting to these main roads were smaller roads, the streets where people lived.
    Bridges.
    Roman bridges were built with stone and/or concrete and utilized the arch. Built in 142 BC, the Pons Aemilius, later named Ponte Rotto (broken bridge), is the oldest Roman stone bridge in Rome. The biggest Roman bridge was Trajan's Bridge over the lower Danube, constructed by Apollodorus of Damascus, which remained for over a millennium the longest bridge to have been built both in terms of overall and span length. They were most of the time at least 60 feet (18 m) above the body of water.
    Carts.
    Roman carts had many purposes and came in a variety of forms. Freight carts were used to transport goods. Barrel carts were used to transport liquids. The carts had large cylindrical barrels laid horizontally with their tops facing forward. For transporting building materials, such as sand or soil, the Romans used carts with high walls. Public transportation carts were also in use with some designed with sleeping accommodations for up to six people.
    The Romans developed a railed cargo system for transporting heavy loads. The rails consisted of grooves embedded into existing stone roadways. The carts used in such a system had large block axles and wooden wheels with metal casings.
    Carts also had brakes and elastic suspensions. The elastic suspension systems used leather belts attached to bronze supports to suspend the carriages above the axles. The system helped to create a smoother ride by reducing vibration. The Romans adopted bearings developed by the Celts. The bearings decreased rotational friction by using mud to lubricate stone rings.
    Industry.
    Mining.
    The Romans also made great use of aqueducts in their extensive mining operations across the empire, some sites such as Las Medulas in north-west Spain having at least 7 major channels entering the minehead. Other sites such as Dolaucothi in south Wales was fed by at least five leats, all leading to reservoirs and tanks or cisterns high above the present opencast. The water was used for hydraulic mining, where streams or waves of water are released onto the hillside, first to reveal any gold-bearing ore, and then to work the ore itself. Rock debris could be sluiced away by hushing, and the water also used to douse fires created to break down the hard rock and veins, a method known as fire-setting.
    Alluvial gold deposits could be worked and the gold extracted without needing to crush the ore. Washing tables were fitted below the tanks to collect the gold-dust and any nuggets present. Vein gold needed crushing, and they probably used crushing or stamp mills worked by waterwheels to comminute the hard ore before washing. Large quantities of water were also needed in deep mining to remove waste debris and power primitive machines, as well as for washing the crushed ore. Pliny the Elder provides a detailed description of gold mining in book XXXIII of his Naturalis Historia, most of which has been confirmed by archaeology. That they used water mills on a large scale elsewhere is attested by the flour mills at Barbegal in southern France, and on the Janiculum in Rome.


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    5 mins
  • 32 - Waterworks.

    32 - Waterworks.
    Mar 4 2026
    Waterworks.
    Sanitation.
    The Romans did not invent plumbing or toilets but instead borrowed their waste disposal system from their neighbors, particularly the Minoans. A waste disposal system was not a new invention, but rather had been around since 3100 BCE, when one was created in the Indus River Valley. The Roman public baths, or thermae served hygienic, social and cultural functions. The baths contained three main facilities for bathing. After undressing in the apodyterium or changing room, Romans would proceed to the tepidarium or warm room. In the moderate dry heat of the tepidarium, some performed warm-up exercises and stretched while others oiled themselves or had slaves oil them. The tepidarium's main purpose was to promote sweating to prepare for the next room, the caldarium or hot room. The caldarium, unlike the tepidarium, was extremely humid and hot. Temperatures in the caldarium could reach 40 degrees Celsius (104 degrees Fahrenheit). Many contained steam baths and a cold-water fountain known as the labrum. The last room was the frigidarium or cold room, which offered a cold bath for cooling off after the caldarium. The Romans also had flush toilets.
    Roman baths.
    The containment of heat in the rooms was important in the operation of the baths, as to avoid patrons from catching colds. To prevent doors from being left open, the door posts were installed at an inclined angle so that the doors would automatically swing shut. Another technique of heat efficiency was the use of wooden benches over stone, as wood conducts away less heat.



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    2 mins
  • 30 - Ancient Roman technology.

    30 - Ancient Roman technology.
    Mar 4 2026
    Ancient Roman technology. 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. 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 strength – one 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...
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    7 mins