Brigade of Gurkhas Brigade of Gurkhas Brigade of Gurkhas is the collective name which refers to all the units in the British Army that are composed of Nepalese Gurkha soldiers. The brigade, which is 3,640 strong, draws its heritage from Gurkha units that originally served in the British Indian Army prior to Indian independence, and prior to that served for the East India Company. The brigade includes infantry, engineering, signal, logistic and training and support units. They are known for their kukris, a distinctive heavy knife with a curved blade, and have a reputation for being fierce and brave soldiers. The brigade celebrated
Foucault knife-edge test Foucault knife-edge test The Foucault knife-edge test was described in 1858 by French physicist Léon Foucault to measure conic shapes of optical mirrors, with error margins measurable in fractions of wavelengths of light (or Angstroms, millionths of an inch, or nanometers). It is commonly used by amateur telescope makers for figuring small astronomical mirrors. Its relatively simple, inexpensive apparatus can produce measurements more cost-effectively than most other testing techniques. It measures mirror surface dimensions by reflecting light into a knife edge at or near the mirror's centre of curvature. In doing so, it only needs a tester which in its