F. H. Richardson's bluebook of projection (1935)

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SPEAKERS 1. Explain the construction and operation of a telephone receiver. The Magnetic Type Speaker, page 585 ' — 2. Explain the construction and operation of a magnetic speaker. 3. Does a magnetic speaker have a "field coil"? i 0". The Dynamic Type Speaker, page 587 ■ 4. Explain the construction and action of a dynamic speaker./^ 5. What is the field coil? Describe four sources of supply for it. 6. What is the voice, or speech coil ? "^VaZo Horns and Baffles, page 589 7. Why are horns used? 8. What are "directional baffles" and why are they used? 9. Why are flat baffles used ? A '■ , Increasing Speaker Frequency Range, page 590 10. What arc "woofers"? 11. What are "tweeters"? 12. What is a crystal speaker? fr*-** 13. Why are flexible arrangements necessary in the transmission line to loud speakers? Speaker Care and Troubles, page 594 «?« 5 ' 14. Name and explain three principal speaker troubles. 15. What precautions are needed in speaker transmission and supply lines? 16. What is meant by "poling" speaker units? *^u . , 583 "