Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 333
tly lose theirattractive force. The armature is then carried back to its originalposition by the spring Iv, making contact at D, and the process isrepeated. The hammer will thus vibrate and the bell continue to ring as long as the circuit is closed. The type of bell described above i, fhe one most…
Architecture · Building · Carpentry
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