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The VPAM scale as of 2009 runs from 1 to 14, with 1-5 being soft armor, and 6-14 being hard armor. [1] Tested armor must withstand three hits, spaced 120 mm (4.7 inches) apart, of the designated test threat with no more than 25 mm (0.98 inches) of back-face deformation in order to pass.
Pole building design was pioneered in the 1930s in the United States originally using utility poles for horse barns and agricultural buildings. The depressed value of agricultural products in the 1920s, and 1930s and the emergence of large, corporate farming in the 1930s, created a demand for larger, cheaper agricultural buildings. [2]
Wooden cattle barn (early 20th century) in Nunspeet, Netherlands. A functionally classified barn is a barn whose style is best classified by its function. Barns that do not fall into one of the broader categories of barn styles, such as English barns or crib barns, can best be classified by some combination of two factors, region and usage.
The Gothic-arch design was featured on both the front and back cover of The Book of Barns - Honor-Bilt-Already Cut [a] catalog published by Sears Roebuck in 1918. It was the most popular roof design for barns sold by Sears. [7] In 1915, Sears sold a 42-by-60-foot (13 m × 18 m) Gothic-arch barn for $1,500.
This standard test has remained in use despite the modern usage of many other types of armour, some of which do not include steel or any other metals. RHA was in common use as primary armour until after World War II , during which a new generation of anti-tank rounds using shaped charges came into use instead of heavy high-velocity projectiles.
The quality of the metal used in armor deteriorated as armies became bigger and armor was made thicker, necessitating breeding of larger cavalry horses. If during the 14th and 15th centuries armor seldom weighed more than 15 kg (33 lb), then by the late 16th century it weighed 25 kg (55 lb). [ 14 ]
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