Tuesday, August 9, 2011

Inventions: BLACKBOARD

James Pillans invented blackboard in 1800s. He worked as the headmaster of the Old High School of Edinburgh, Scotland. This slate had wooden frames to protect them from breaking. The earliest blackboards were simply small pieces of slate. In place of chalk, students would use another piece of slate to write on the board. Written remarks would be erased with the use of a rag in order for the student to work on the next lesson. James Pillans took slates and hung them on the wall to teach them Geography and this brought him an idea of the blackboard. Mr. George Baron, a Maths teacher carried this idea to the United States in 1801. He gave maths presentations on the blackboard in the West Point Military Academy, a place where he taught. The idea got popular among the teachers as it saved time, enhanced understanding and helped cater a larger group at the same time.
Soon the blackboard production started in Maine, Maryland, Virginia, Vermont and New York and was supplied all over America. The blackboard became a common teaching aid for all the schools. And since then blackboards are part and parcel of all the classrooms all over the world. This invention brought revolution in the field of education.

Friday, August 5, 2011


JBL-ES80 Floor Standing Speaker
Price:- Rs. 45000
With innovative technologies derived directly from JBL Professional equipment, the JBL ES Series delivers powerful, accurate audio performance. The JBL-ES80 is floor standing speakers delivers accurate performance and bring down the house powered subwoofers. The dual 6 inch woofers provides deep, accurate bass response and the ultrahigh-frequency driver extends response out to 40kHz, making the ES80 perfect for the latest high-definition recordings and broadcasts. The ES80 performs well over all kinds of music material - classical, jazz, rock, vocal, etc. and can play loudly without breaking up. It is easy to connect and easy to use.
Type: Floor standing Speaker
Finish: Black Ash
Crossover frequencies: 700Hz, 3.6kHz – 24dB/octave; 12kHz – 18dB/octave
Frequency range: 45Hz – 40kHz
Sensitivity: 91dB
Impedance: 8 Ohms
Power: 100 Watts Continuous /400 Watts Peak
Low frequency transducers: Dual 170mm (6 inch) PolyPlas™, shielded
Midrange transducer: 100mm (4 inch) PolyPlas, shielded
High frequency transducer: 19mm (3/4 inch) Titanium-laminate dome, shielded; EOS waveguide
Ultrahigh frequency transducer: 19mm (3/4 inch) Polyester-film ring-radiator, shielded; EOS waveguide
Height: 1084 mm
Width: 223 mm
Depth: 330 mm
Weight: 21 kg

Tuesday, August 2, 2011

Nokia 500 Smartphones

Expected Price: 9000 Rs.
Nokia recently launched Nokia 500 Smartphone. It has a large 3.2-inch capacitive touch screen display and is pre-loaded with the latest Symbian Anna operating system. It is powered by a 1GHz processor and supports high speed 3G, Wi-Fi connectivity. It comes in three different color back covers.
·         3.2-inch touch screen
·         Symbian Anna OS
·         5MP camera
·         Affordable price
·         3G HSDPA
·         Wi-Fi
·         3 different-colored back covers
·         GPS navigation
Network: Quad band GSM, Dual band UMTS
Processor: 1GHz
Dimensions: 111.3 x 53.8 x 14.1mm
Weight: 93g
Operating System: Symbian Anna
Display: 3.2-inch capacitive touch screen, 640×360 pixels resolution
Camera: 5 mega-pixel (without flash), Video recording
Stereo FM Radio
Music Player
Video Player
Internal memory: 2GB
Expandable memory: up to 32GB
3G HSDPA/HSUPA (up to 5.8Mbps)
Wi-Fi 802.11 b/g
Navigation: Free Nokia voice navigation, GPS with A-GPS
Talk time: up to 7 hours
Standby time: 450+ hours
Music playback time: up to 35 hours