he casing, This collector takes the current from the commuta- open inlets leading to air tor cylinder by a rolling contact, thus avoiding the valves of any approved friction and wear due to the use of commutator construction, located with- brushes. The improvement has been patented by Mr. in the… … As shown in Fig. 2, the 4 air outlet valves are ar- | ranged directly in the main valve, which is in sectional view, showing the relative proportious of the this case a float top valve, parts, more particularly for high and ordinary speeds, the air being similarly dis- while in Fig. 3 the parts are…
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