Modern Practice of the Electric Telegraph: A Handbook for Electricians and OperatorsD. Van Nostrand, 1872 - 160 páginas |
Dentro del libro
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Página vii
... Distance of Faults . The Loop Test .... To Find the Distance of a Cross .... Advantages of Testing by Measurement .... 80 81 84 85 86 Testing for Conductivity Resistance .. 87 CHAPTER VII . NOTES ON TELEGRAPHIC CONSTRUCTION . Poles ...
... Distance of Faults . The Loop Test .... To Find the Distance of a Cross .... Advantages of Testing by Measurement .... 80 81 84 85 86 Testing for Conductivity Resistance .. 87 CHAPTER VII . NOTES ON TELEGRAPHIC CONSTRUCTION . Poles ...
Página 22
... distance of the wire from the core , each layer of wire acting with less power than the one beneath it . 36. Every addition to the length of the conducting wire enfeebles the current , because of the increased re- sistance ( 5 , 6 ...
... distance of the wire from the core , each layer of wire acting with less power than the one beneath it . 36. Every addition to the length of the conducting wire enfeebles the current , because of the increased re- sistance ( 5 , 6 ...
Página 28
... distance not ex- ceeding 20 or 30 miles , a register , whose coils are wound with No. 30 copper wire , may be worked by the line current , if the line be well insulated ( 57 ) . 55. When the insulation is defective , or the circuit so ...
... distance not ex- ceeding 20 or 30 miles , a register , whose coils are wound with No. 30 copper wire , may be worked by the line current , if the line be well insulated ( 57 ) . 55. When the insulation is defective , or the circuit so ...
Página 31
... distance from the arma- ture by means of the screw a , which is cut with a right and left hand thread , passing through the soft iron bar connecting the two cores , and also through the support- ing post in the rear of the coils . The ...
... distance from the arma- ture by means of the screw a , which is cut with a right and left hand thread , passing through the soft iron bar connecting the two cores , and also through the support- ing post in the rear of the coils . The ...
Página 37
... distance from the ar- mature , to avoid the influence of the residual magnet- ism , caused by the escape of the " current " from the line . This is called " adjusting " the instrument , and is one of the most important of an operator's ...
... distance from the ar- mature , to avoid the influence of the residual magnet- ism , caused by the escape of the " current " from the line . This is called " adjusting " the instrument , and is one of the most important of an operator's ...
Términos y frases comunes
acid action adjusted annealed apparatus armature arranged attached binding screws button Callaud Carbon cells Chatterton's compound Cloth conducting conductor construction copper wire cuit Daniell Daniell cells dashes deflection diameter difference direction distance distant end dots earth effect Electric Telegraph electricity electro-magnet electro-motive force employed equal escape Fahr fault follows formula galvanometer gauge Grove battery gutta-percha Hypsometry inches increased instrument insulation J. B. Stearns joint resistance known resistance latter length lever lightning arrester line of tension line wire local battery loop main battery main circuit measure metallic method Morse needle number of convolutions ohms operator opposite ordinary placed plate platina porous cup portion position practice principle proportion pure copper relay magnet repeater represented resistance coils rheostat shown in fig signals solution sounder station statute mile sulphate switch tangent telegraph line terminal station tery testing tion total resistance type wheel versine zero zinc
Pasajes populares
Página 91 - The fundamental demands of health require the purification of a classroom by direct sunlight; but it is also necessary to introduce this all-important purifying agent in such a manner as to prevent as far as possible the direct rays of the sun from falling on the desks and books of the pupils while they are engaged in study. If the windows of a classroom are placed on the north side of a building located in any section of our country, very little direct sunshine will ever enter, and during the school...
Página 103 - To become an expert sending and receiving operator requires a vast amount of time and patience, and the most unwearied application. Remember that whatever is worth doing at all, is worth doing well.