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Bradfield Leading-In Insulator No.1, by Marconi Company, England, 1910
Inventory Number: 13694
Number of documents: 1
Document Type: Miscellaneous Note
Document Heading: Bradfield Leading-In Insulator No.1
Text:
The Bradfield Leading-In Insulator No.1 was designed for marine use. The cone keeps part of the insulator dry under almost any weather conditions. The ebonite discs, known as anti-spark discs, are fitted at intervals along an ebonite tube containing a steel rod, and assist in preventing sparking over the surface in wet weather. The insulator is led into the wireless cabin through a hollow casting that is fixed in a rigid position to the roof or side of the cabin.
The Bradfield Leading-In Insulator No.1 was designed for marine use. The cone kept part of the insulator dry under almost any weather conditions. The ebonite discs, known as anti-spark discs, were fitted at intervals along an ebonite tube containing a steel rod, and assisted in preventing sparking over the surface in wet weather. The insulator was led into the wireless cabin through a hollow casting that is fixed in a rigid position to the roof or side of the cabin.
The Bradfield Insulator was of dual purpose. First, it minimised signal leakage to non-conducting surface sections. Secondly, it improved safety: the high voltage travelling through the aerial leads could be lethal to a person coming into contact with it. This device was described in Hawkhead, Technical Instruction for Wireless Telegraphy, 2nd edition (1915).
Such a device was commonly used in shipping lines, such as the White Star Line, in the 1910s. In fact, an insulator identical to this model was used aboard both the Olympia and her sister ship, the Titanic.
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