rmit- meteorological Balloons. ting a uniform travel of the piston in the brake cylin- valve is used, so that while there is a vacuum in the A balloon equipped with self-registering instruments trap bowl the check remains closed and the vacuum der and insuring a full and effective pressure in the… … up to 1,000 covering the pipe at all times prevents the escape of FREESE AND NICHOLSON'S BRAKE SLACK ADJUSTER. miles and re- any steam. peats. It is When one takes into consideration the adaptability improvement has been patented by Messrs. William made of alumi- of steam traps, it is not at all…
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