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Color of brass
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CURRENT ToPIcs. RECAPITULATION.
This paper describes a method of employing the watch-case telephone receiver in the comparing o.f capacities by the alternating-current bridge method. The use of this scheme does away with the difficulties ordinarily encountered in attempts to use the receiver in this way. The success of the method is due to the fact that the human ear is much more sensitive to a noise or sound of very low frequency, in the presence of a barely audible note of high frequency, than to. the latter alone. By this method, which is here denominated the " method of beats," such a receiver may be used to balance an alternating-current capacity bridge: ( I ) On frequencies too low to sensibly affect the ear. (2) In cases where the time-constant balance is a function of the current strength in the bridge circuit. Simple means are suggested for the ready application of the method to commercial as well as to laboratory measurements. WILKINSBURG, PA., November 9, 1912.
Color of Brass. ANON. (Brass World, viii, 9, 33o.)--The composition of brass may be approximately determined by its color. Brass containing 5 per cent. zinc--red. Brass containing IO per cent. zinc bronze color. Brass containing 15 per cent. zinc light orange. Brass containing 20 per cent. zinc--greenish - yellow (green brass). Brass containing 25 per cent. zinc--greenish - yellow (green brass). Brass containing 3° per cent. zinc--true yellow brass color. Brass containing 35 per cent. zinc--true yellow brass color. Brass containing 40 per cent. zinc--reddish-yellow. Brass containing 4g per cent. zinc--rich golden color (orange). Brass containing 5° per cent. zinc--richer golden color. Brass containing 55 per cent. zinc--like I4-karat gold. Brass containing 60 per cent. zinc--yellowish-white. Brass containing over 60 per cent. zinc--white and then gray. Or, very soft brass, red or orange, contains Io to 15 per cent. zinc, greenish-yellow brass contains 20 to 25 per cent. zinc, brass of the true brass color contains 3° to 38 per cent. zinc, and hard brass, of orange-yellow color, contains more than 38 per cent. zinc, and less than 60 per cent.
CURRENT ToPIcs. RECAPITULATION.
This paper describes a method of employing the watch-case telephone receiver in the comparing o.f capacities by the alternating-current bridge method. The use of this scheme does away with the difficulties ordinarily encountered in attempts to use the receiver in this way. The success of the method is due to the fact that the human ear is much more sensitive to a noise or sound of very low frequency, in the presence of a barely audible note of high frequency, than to. the latter alone. By this method, which is here denominated the " method of beats," such a receiver may be used to balance an alternating-current capacity bridge: ( I ) On frequencies too low to sensibly affect the ear. (2) In cases where the time-constant balance is a function of the current strength in the bridge circuit. Simple means are suggested for the ready application of the method to commercial as well as to laboratory measurements. WILKINSBURG, PA., November 9, 1912.
Color of Brass. ANON. (Brass World, viii, 9, 33o.)--The composition of brass may be approximately determined by its color. Brass containing 5 per cent. zinc--red. Brass containing IO per cent. zinc bronze color. Brass containing 15 per cent. zinc light orange. Brass containing 20 per cent. zinc--greenish - yellow (green brass). Brass containing 25 per cent. zinc--greenish - yellow (green brass). Brass containing 3° per cent. zinc--true yellow brass color. Brass containing 35 per cent. zinc--true yellow brass color. Brass containing 40 per cent. zinc--reddish-yellow. Brass containing 4g per cent. zinc--rich golden color (orange). Brass containing 5° per cent. zinc--richer golden color. Brass containing 55 per cent. zinc--like I4-karat gold. Brass containing 60 per cent. zinc--yellowish-white. Brass containing over 60 per cent. zinc--white and then gray. Or, very soft brass, red or orange, contains Io to 15 per cent. zinc, greenish-yellow brass contains 20 to 25 per cent. zinc, brass of the true brass color contains 3° to 38 per cent. zinc, and hard brass, of orange-yellow color, contains more than 38 per cent. zinc, and less than 60 per cent.