#Exhibit of the Month

Fire artillery in Romanian space is attested from the first half of the 15th century. The oldest pieces of artillery are the bronze and iron bombards discovered in the fortresses of Giurgiu, Severin, Bârlad and Orheiul Vechi.

The exposed cannon was discovered in the village of Grinăuți-Moldova, Ocnița district, it dates from the second half of the 15th century. From a typological point of view, in the central-eastern European space, the cannon from Grinăuți-Moldova is a unique piece.

It is a short-barreled mortar-type artillery piece that fits perfectly into the line of bombards in Europe used in the second half of the 15th century - the beginning of the 16th century.

The cannon was used to launch projectiles (bullets) at the enemy behind fortifications or natural obstacles. The projectiles were loaded through the mouth of the barrel. The firing angle was over 45 degrees, and the trajectory of the projectile was curved with a range of up to 300-400 m. In Europe, these cannons were called mortars, and in Romanian space they were designated by the word piua, thanks to the shape of this object.

The cannon from Grinăuți-Moldova was discovered by chance in the "Red Bank" location, located 15 km southwest of the Lipnicu plain where Lord Stefan the Great defeated the Tatars in 1470. According to a legend from the village of Grinăuți-Moldova, in the "Red Bank" location, a military confrontation between Moldovans and Tatars would have taken place prior to the battle of Lipnic.

The cannon from Grinăuți-Moldova is made of cast iron by the casting method. The barrel is provided with a single hole in the front, the opposite side being blocked by the flat bottom with flared edge. The inside of the pipe is a relatively wide channel that narrows slightly towards the bottom. Loading with powder and cannonballs was done through the mouth of the cannon. A hole is provided near the base for the wick to ignite and detonate the dust inside the cannon. The surface of the cannon is embossed. The edge of the mouth is thickened, slightly curved. Two cylindrical supports with a diameter of 3.5 cm are provided in the central part of the body of the cannon in the axis, which served as handles for the installation and handling of the cannon on a wooden frame.

The length of the cannon is 30.0 cm, the maximum diameter of the body - 17.8 cm, the outside diameter of the mouth - 19.4 cm, the diameter of the body in the middle - 13.5 cm, the outside diameter of the base - 17.0 cm, the caliber of the cannon (mouth diameter) is 12.8 cm, the length of the inner chamber of the cannon - 27.4 cm, the weight of the cannon - 18,730 kg.

The cannon from Grinăuți-Moldova entered the custody of the National Museum of History of Moldova through the care of local history teacher Vlad Lvovsky.

The conservation of the piece of cultural heritage was carried out by Valeriu Bubulici, and the reconstruction of the atmosphere by the restorer Mihail Culașco.

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#Exhibit of the Month

February 2023

Radio receivers: Telefunken and Philips

Radio represents one of the outstanding technological achievements of human thought, which led to the emergence and development of the most powerful and popular means of mass communication. From its beginnings, radio broadcasting had immediate effects on the social, economic, military, but also on the cultural level.

Radio is the work of time, to which many scientists have contributed. Among the most important names we mention: the Scottish physicist James Clerk Maxwell, who predicted, in 1860, the existence of radio waves; the German physicist Heinrich Rudolph Hertz, who demonstrated that rapid variations in electric current could be projected into space as radio waves; the American inventor of Croatian origin Nicola Tesla, who, in 1891, built the theoretical model of the device that produced electromagnetic cycles.

Those who are primarily credited with this discovery - the Italian inventor Guglielmo Marconi and the Russian physicist Alexander Popov - did nothing more than synthesize or weave together floating ideas, so no one has intellectual authorship, which does not exclude their rights conferred by patents and glory.

For more than 120 years, radio has been telling stories, saving lives, delivering news, educating generations, providing a means of recreation, shaping a society's experience of diversity. As a sign of appreciation for this powerful vector of information and culture, UNESCO instituted, in 2012, a special holiday, World Radio Day, which is celebrated worldwide on February 13.

The advent of sound broadcasting propelled the development of radio technology. Gradually, starting in 1920, the need for collective auditions determined the manufacture of the first loudspeakers based on the principle of electromagnetic induction, which had a diaphragm or a diffuser cone. Moved by a metal paddle, they actuated a large mass of air, thus producing loud sounds. Overcoming the evolutionary framework, with all the inherent difficulties, the radio was continuously perfected, with predilection after the invention of radio lamps and transistors, arriving at the construction of increasingly complex devices.

The National Museum of History of Moldova conserves and uses about 120 radio receivers with historical, technical and memorial value, manufactured between 1934 and the beginning of the 21st century in various countries. The radio sets in the museum heritage are of interest for the history of science and technology, some of them standing out as reference pieces for the evolution of means of communication.

From the point of view of the principle of operation, the radios owned by the museum are direct-amplified, reactive and superheterodyne. From a categorical point of view, the museum's radio technical fund is made up of: 36 radio equipment, 17 radio receivers with electronic tubes and 68 transistorized radio receivers. This month, as part of the "Exhibit of the Month" series, we bring to the public's attention two stationary radio receivers with electronic tubes, Telefunken and Philips, of great historical and technical value, they laid the foundations for the constitution of the museum's collection of radio devices.

Telefunken radio receiver, model Koncert Trial, was manufactured at the Radiotechna enterprise in Prague-Prelouc, Czechoslovakia, between 1934 and 1935. It is a superheterodyne device, in a Bakelite case. Technical characteristics: 4 electronic tubes - REN904, REN904, RENS1374S and RGN564; the wave ranges - UL (long waves), UM (medium waves) and US (short waves); dimensions - 290x355x175 mm; power supply - 110/240 V; speaker - permanently dynamic.

Philips radio receiver, model 36U, was manufactured in 1943 at the Philips workshop in Hungary (which operated from 1931 to 1949). It is a superheterodyne device, in a bakelite case. Technical characteristics: 4 electronic tubes - UCH21, UCH21, UBL21 and UY21; wave ranges: UL (long waves) and US (short waves); dimensions: 250x170x130 mm; power supply: 110/150/220 V, weight: 2.5 kg; speaker - permanently dynamic.