Bakspole

Bakspole is a Dutch term used in electronics to describe a coil that is mounted in and associated with a shallow tray or basin (bak). The word is sometimes found in sources as bakspoel or bak-spole, reflecting variations in spelling. The central idea is a winding (spoel) whose assembly is placed in a tray to facilitate cooling, insulation, and handling during construction, testing, or maintenance.

Construction and design typically involve copper windings arranged around a magnetic core, with the entire coil seated in a tray made of metal or wood. In many historical designs the tray aided cooling and insulation, sometimes incorporating insulating oil or resin around the windings, though other configurations exist that keep the coil dry. The tray-based form allows for easier mounting, replacement, and servicing within larger equipment.

Applications and usage have been described in connection with various electro-mechanical devices, including early transformers, inductors, electromagnets, and laboratory setups. In antique radio gear and experimental apparatus, bakspoles were one of several practical coil implementations, valued for their modularity and ease of handling.

Etymology and regional usage: the term combines bak (tray) and spoel (coil) in Dutch, and contexts vary by source. Because it is primarily found in Dutch-language or historical texts, precise definitions and implementations can differ across periods and manufacturers.

See also: spoel, transformer, inductance, electromagnet.