Abstract: A firing tip for a spark plug assembly comprises an iridium-rhodium alloy. The firing tip is resistance welded to an electrode for use with a long life spark plug. A thermal expansion dividing layer can be bonded between the electrode surface and iridium-rhodium firing tip to prevent peeling, cracking and/or spalling due to thermal stress fatigue. The thermal expansion dividing material can be a platinum-nickel alloy having a coefficient of thermal expansion compatible with both the electrode material and iridium-rhodium alloy.

Abstract: A firing tip for a spark plug assembly comprises an iridium-rhodium alloy. The firing tip is resistance welded to an electrode for use with a long life spark plug. A thermal expansion dividing layer can be bonded between the electrode surface and iridium-rhodium firing tip to prevent peeling, cracking and/or spalling due to thermal stress fatigue. The thermal expansion dividing material can be a platinum-nickel alloy having a coefficient of thermal expansion compatible with both the electrode material and iridium-rhodium alloy.

Abstract: A cathode ray tube caligraphic display system is described which automatically varies the beam intensity as a function of the writing or "stroke" rates to provide automatic brightness compensation as the symbol or vector write rates vary. The X and Y write rate signals are provided in digital form and converted to ramp voltages of varying slopes to "stroke" the line segments for the desired symbols, vectors or other indicia. The digital X and Y write rate signals are also applied to a Read Only Memory (ROM) which has brightness compensation data stored therein for various combinations of X and Y write rates. The digital signals representing the X and Y write rates function as addresses to the Read Only Memory to read out brightness compensation control signals to control the brightness of the symbol or other displayed object as a function of the write rates.