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继錄音鋼絲后的產物,是錄音磁帶。由於磁帶能錄的音週範圍較廣,並且制造簡單,正在或將要廣泛地為宣教事業應用。錄音带本身是將一層磁性的化合物,主要是極微粒的磁性氧化铁,塗在可塑體或紙上。所以,要自製錄音帶,首先要解决兩個问题:一個是製可塑體,特別是性软而靱的一類化合物。另一個問題,就是製具有一定磁性和其他特性的氧化鐵。今將個人試製氧化鐵的大概、介紹如下。磁性氧化鐵的通式為Fe_2O_4。有天然產。但如何製造,手邊沒有资料。因此,就從氧化鐵Fe_2O_3,着手,將三氧化鐵與氫氧化銨共熱。这样製成的氧化鐵磁感極弱(是以磁石對它的引力推測的)。後在一九四六年的化學年鑑上,註一看到有一項关于製造磁帶的敘述。這樣,就根據了這一記載試製了幾次。最後的結果如下:
Following the recording wire products, is a tape recording. Tapes are being or will be widely used for missionary purposes because of the wide range of soundweights they can record and their ease of manufacture. The tape itself is a layer of magnetic compounds, mainly magnetic particles of iron oxide, coated on plastic or paper. Therefore, to make audio tapes, we must first solve two problems: one is a class of compounds that make plastic bodies, especially those that are soft and soft. Another problem is the formation of iron oxide with certain magnetic and other properties. This trial of iron oxide will probably be introduced as follows. The general formula of magnetic iron oxide is Fe 2 O 4. There are natural products. But how to make, there is no information at hand. Therefore, starting from the iron oxide Fe_2O_3, the iron oxide is co-heated with the ammonium hydroxide. The iron oxide thus made is extremely weakly magnetized (presumably by the magnet’s attraction to it). Later, in the 1946 Yearbook of Chemistry, he noticed a narrative of making a tape. In this way, according to this record trial a few times. The final result is as follows: