. An elementary book on electricity and magnetism and their applications. ls 1. A dash is equal to 3 dots. 3. The space between two letters 2. The space between the sig- is equal to 3 dots. nals which form the same 4. The space between two wordsletter is equal to one dot. is equal to 5 dots. LETTERS A • - U • • - B - • • • V • • • - C - • - • W • D - • • X — • • - E • Y - • F • • - • Z - - • • G — — • a (German) H • • • • o« - • - 1 • • a or a (Spanish—Scandinavian) J • • • - K — • — ch (German) L • — • • __- — ^X — — 6 ( French) N - • ••-•• 0 — — — n (Spanish; P • • • q _ — # — o (German) R •
. An elementary book on electricity and magnetism and their applications. ls 1. A dash is equal to 3 dots. 3. The space between two letters 2. The space between the sig- is equal to 3 dots. nals which form the same 4. The space between two wordsletter is equal to one dot. is equal to 5 dots. LETTERS A • - U • • - B - • • • V • • • - C - • - • W • D - • • X — • • - E • Y - • F • • - • Z - - • • G — — • a (German) H • • • • o« - • - 1 • • a or a (Spanish—Scandinavian) J • • • - K — • — ch (German) L • — • • __- — ^X — — 6 ( French) N - • ••-•• 0 — — — n (Spanish; P • • • q _ — # — o (German) R • - • • S • • • h (German) T — • • ™ ~ NUMERALS 1 * _ _ _ - 6 — • • • • 2 • • ••• 3 • • • 8 •• 4 • • • • - 9 • 5 0 PUNCTUATION AND OTHER SIGNS Full stop (•) • • * * * * Semicolon (0 ™ • ~ • ™ * Comma (») •-•—•- Colon (0 • • • 554 ELECTRICITY AND MAGNETISM Aerial. Fig. Ground ^^r405. — Inductive-coupled transmitting station. 376. Sending circuits. In commercial radiotelegraphycoupled circuits are now quite generally employed. These are of two gen-eral types: theinductive cou-pling, which isillustrated in fig-ure 405, and thedirect coupling,which is illus-trated in figure406. The princi-ple involved ineach case is thatof the high-fre-quency trans-former inventedby Tesla and Thomson. This step-up transformer differs fromthe ordinary transformer in that it has no iron core. Theprimary, which consists ofa few turns of heavy wire, isconnected in series with aspark gap and a the spark gap isconnected across the second-ary of an induction coil, orbetter, with the secondaryof a step-up transformer,the condenser is repeatedlycharged and dischargedacross the gap with oscil-lations of extremely high frequency. A group of these oscillations comes during eachspark at
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
