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By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...
A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.
Tulcea (Romanian pronunciation: [ˈtult͡ʃe̯a]; also known by alternative names) is a city in Northern Dobruja, Romania. It is the administrative center of Tulcea County , and had a population of 65,624 as of 2021 [update] .
Tulcea Danube Delta Airport (IATA: TCE, ICAO: LRTC) (also known as Cataloi Airport) is located in south-eastern Romania, 16 km (9.9 mi) south [2] of the city of Tulcea, on the Danube bank and close to the Danube Delta. It is Northern Dobruja's second airport after Mihail Kogălniceanu International Airport, which serves Constanța.
Pascaline (also known as the arithmetic machine or Pascal's calculator) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen . [ 2 ]
Topolog is a commune in Tulcea County, Northern Dobruja, Romania.It is composed of seven villages: Calfa, Cerbu (historical name:Hagiomer), Făgărașu Nou, Luminița (historical names: Rum Ali, Urumbei - until 1925, Regina Elisabeta - until 1948, Elena Pavel - until 1964), [3] Măgurele, Sâmbăta Nouă and Topolog.
The commune is located in the southern part of the county, 80 km (50 mi) from the county seat, Tulcea, on the border with Constanța County. The river Casimcea has its source in Războieni village, at an altitude of 300 m (980 ft), and flows southeast through Casimcea village, discharging in Lake Tașaul , close to the Black Sea coast.