Show 0 IMPROVED BLAST GAUGE the ordinary blast gauge used for determining ter mining blast pressure at the furnaces of reduction works consists of a glass tube filled with mercury connected connected by tubing with the blast pipe one end of which is open to atmospheric pressure the difference in the level of the two arms is the measure of the blast pressure above atmosphere A novel improvement over the old style is shown in the accompanying illustration the mercury filled manometer tube is enclosed in a heavy glass tube with air improved blast claugue tight ends the whole being surrounded by a casing made from a 3 inch pipe with hinges and latch as shown lugs are provided for securing it to a post or other support it is provided W with ith an accurate scale and fractions the arrangement graduated to ounces ran gement is convenient and compact and the danger cf breakage due to heat or carelessness is greatly lessened so that it can be placed in more convenient positions without w added danger this improved gauge is hand handled led by the salt lake branch of f the mine smelter supply company |