Music of Philadelphia and actress. Benjamin Franklin was also a musician, a guitar teacher and inventor of musical instruments like the glass armonica. In 1784 Andrew Adgate organized the Institution for the Encouragement of Church Music, renamed the Uranian Academy (1787–1800). The school was the center of the city's choral music scene during the latter part of the 18th century. The earliest known performance of a musical drama in Philadelphia was Colley Cibber’s "Flora, or Hob in the Well", a ballad opera performed by a touring opera company from England in 1754. In 1757 Francis Hopkinson mounted an elaborate production of Thomas Arne’s
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