Abstract: A stringed instrument is equipped with an electrical conductor electrically connected to the frets mounted in the fretboard of said stringed instrument. Said stringed instrument is also equipped with a power source, light emitting members in electrical contact with the strings of the instrument (in one embodiment light emitting diodes) and electrical conductors electrically connecting together the components of the invention. By means of pressing down anyone of the strings capable of transmitting electric current against anyone of the frets capable of transmitting electric current connected to the electrical circuit comprised of said electrical components, said circuit closes and the light emitting member(s) associated with the string that is pressed down against the fret is lit. Preferably each string of the stringed instrument has at least one specific light emitting member connected to it.

Abstract: A universal force measurement apparatus has a top plate onto which a first test object is mounted. The top plate is connected to a middle plate via a sliding member, for example a linear ball slide having a one dimensional degree of freedom. A first load cell is connected to the top plate and the middle plate, hereby preventing them from moving relative to one another in the direction of the degree of freedom of the sliding member. The mid plate is then connected to a second load cell which registers forces in the vertical direction. The second load cell is also connected to a base plate which is placed on a rigid surface. Forces from another object or media acting on the first test object will now be registered by the first and second load cells in the horizontal and vertical directions.

Abstract: A universal force measurement apparatus has a top plate onto which a first test object is mounted. The top plate is connected to a middle plate via a sliding member, for example a linear ball slide having a one dimensional degree of freedom. A first load cell is connected to the top plate and the middle plate, hereby preventing them from moving relative to one another in the direction of the degree of freedom of the sliding member. The mid plate is then connected to a second load cell which registers forces in the vertical direction. The second load cell is also connected to a base plate which is placed on a rigid surface. Forces from another object or media acting on the first test object will now be registered by the first and second load cells in the horizontal and vertical directions.

Abstract: A stringed instrument is equipped with an electrical conductor electrically connected to the frets mounted in the fretboard of said stringed instrument. Said stringed instrument is also equipped with a power source, light emitting members in electrical contact with the strings of the instrument (in one embodiment light emitting diodes) and electrical conductors electrically connecting together the components of the invention. By means of pressing down anyone of the strings capable of transmitting electric current against anyone of the frets capable of transmitting electric current connected to the electrical circuit comprised of said electrical components, said circuit closes and the light emitting member(s) associated with the string that is pressed down against the fret is lit. Preferably each string of the stringed instrument has at least one specific light emitting member connected to it.