Glass harmonica Franz Mesmer also played the armonica and used it as an integral part of his Mesmerism. An original Franklin armonica is in the archives at the Franklin Institute in Philadelphia, having been donated in 1956 by Franklin's descendants after "the children took great delight in breaking the bowls with spoons" during family gatherings. It is only placed on display for special occasions, such as Franklin's birthday. The Franklin Institute is also the home of the Benjamin Franklin National Memorial. A website has attempted to catalog publicly known Franklin-era glass armonicas. The Museum of Fine Arts, Boston has an early 19th-century
Swedish field artillery (early 18th century) regimental field artillery, but for more strategic purposes. The artillery during the early 18th century was developed further by Carl Cronstedt. He combined the powder and projectile into one single thin wooden cartridge called "geschwinda" shots (fast shots) and thereby succeeding in increasing the firing power to 10-12 rounds per minute. In addition, he increased the explosive power of the projectile itself. The range of the 6 pounders was 600–700 meters and the 3 pounders 225 meters. Screws and aiming devices, invented by Christopher Polhem, were introduced and used to aim and adjust the elevation of the pipe. To drag