check Meteorological Balloons. valve is used, so that while there is a vacuum in the ting a uniform travel of the piston in the brake cylin- A balloon equipped with self-registering instruments der and insuring a full and effective pressure in the air trap bow] the check remains closed and 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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