Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 440
rcuit For interrupting tliecurrent and reoculatins:the system of dots andlines, an instrument call-ed the Signal-key, or,Break-piece, Fig. 3G8,is employed. This isplaced near the battery, so as to be in the galvanic cir-cuit. The operator, by pressing down the knob with thofinger, closes the… … ALPHABET. a b C-- - d n 0 - - p q r - - - 8 NUMERALS.1-2--3 / t 4 L— M C 7 9 L. 0 <--i : - 10 !/-- -- m d-- Expprienced operators are often able to understand the message merely from the sounds,or clicks, of the lever. 436 WELLSS NATURAL PHILOSOPHY. What is the 808, In what is known as the Bain/…
Physics · Science · Technology
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