176 



THE WORLD'S ADVANCE 



city. The point upon which its rays are 

 turned is made as light as noonday, and 

 selections in real estate may easily 

 and safely be made. 



The searchlight is a very powerful 

 one, being second in Southern Califor- 

 nia only to the celebrated Mt. Lowe 

 searchlight. It has a rating of 8,500,000 

 candle-power and throws a brilliant 

 stream of light a distance of thirty-two 

 miles. The lamp itself is thirty inches 



deep and thirty inches in diameter. 

 The light and the stand upon which it 

 rests have a combined height of five 

 and a half feet. 



The switch room for this light is lo- 

 cated on the floor below it. In this room 

 are switches, meters, starting boxes and 

 other controlling devices, as well as a 

 6o-cycle, 15 horsepower electric motor 

 and a 56-ampere continuous current 

 generator. 



NEWEST LONG DISTANCE TELE- 

 PHONE TEST BOARD 



The most up-to-date toll-line test 

 board in the world comprises part of 

 the recently completed new long-dis- 



from its corresponding line outside and 

 another line temporarily "patched in" 

 through plugs in the board. 



Each form in the rear of the board 

 supplies two of the eight sections. Lead- 

 ing in at the top are 1,800 pairs of No. 

 1 6 single cotton-covered wires. The 

 forming of these wires alone required 

 three months' time. The wires were 

 brought over studs and drawn through 

 holes in the forming board corresponding 



Front and Rear Views of 



the Most Modern Toll Line 



Test Board, Installed at Los 



Angeles, California. 



tance exchange at Los Angeles, Cal. Any 

 line, inside or outside of the exchange, 

 may be plugged into the board for any 

 kind of test imaginable. Breaks or 

 crosses on long lines are measured to a 

 fraction of a mile with a Wheatstone 

 bridge and galvanometer. A line inside 

 the exchange causing trouble is cut off 



to the jacks to which they lead. The 

 form was then sewed with No. 12 thread 

 lock-stitches and the board removed. It 

 was then given a coat of shellac, fol- 

 lowed by the most tedious job of all> 

 the connecting and soldering. The final 

 dressing-up and shellacing alone took 

 one man two weeks' time. 



