352 



Popular Science Monthly 



enlarging board. 



Before each exposure, 

 the size and position was 

 obtained on the sketch 

 of the whole picture. 

 With the ruby or orange 

 cover on the lens, the 

 enlarging paper was 

 placed exactly over the 

 sketch paper. Then the 

 exposure was made. 

 Both papers were taken 

 down before the next 

 exposure, or changing of 

 negative. 



The effect of distance 

 is obtained by making 

 the object smaller and 

 slightly undertiming the 

 exposure. The longer 

 the exposure,' the sharp- 

 er, clearer, and nearer 

 the object will appear to 

 be when the paper is 

 developed. 



Exposure No. i was 

 over a section of No. 7, 

 and when the latter was 

 made the former blocked 

 out certain parts. 



In exposures 8-9-10 

 the appearance of dis- 

 tance was obtained 

 by gaging the time 

 of exposure and the size, 

 and also, as in No. 8 

 and 10, by throwing the 

 negatives slightly out of focus when exposing. 



In exposure No. 1 1 , the cloud background 

 was exposed over all the paper and greatly 

 enlarged, only a section being used. Care 

 as to the correct timing had to be taken. 

 In fact the exposure was undertimed, as 

 the least bit of overexposure would have 

 spoiled the entire effect. 



Care was taken^ at all times to avoid fog- 

 ging of the enlarging paper. 



A variety of beautiful as well as startling 

 pictures can be made by this process of 

 composite enlarging and printing. The 

 average amateur as well as professional 

 photographer has any number of negatives 

 which when combined will make truly 

 wonderful pictures — pictures that cannot be 

 distinguished from actual photographs. 



But patience is necessary. The "War in 

 the Air" took four tries, and the last pic- 

 ture consumed one hour and twenty 

 minutes making the exposures. 



The photograph marked 9 is the 

 same as Number 10 except that 

 the latter is differently focused 



Hoisted by an Auto- 

 mobile up to the 

 Clouds 



PERHAPS the queer- 

 est use to which the 

 automobile has been put 

 is that illustrated in the 

 photograph below. It 

 shows a steeplejack rest- 

 ing confidently on his 

 nerve and on the end of 

 a steel cable, the other 

 end of which is attached 

 to an automobile below. 

 He is being hoisted to 

 the top of a gigantic 

 steel mast, towering high 

 in the air, to give atten- 

 tion to the antennas of 

 the largest wireless plant 

 in the United States, 

 which is located at Bo- 

 linas, California, about 

 fifteen miles northwest 

 of San Francisco. 



A. A. Isbell, engineer 

 in charge of the plant, 

 states that the steeple- 

 jacks prefer an auto- 

 mobile to a horse for the 

 hoisting, since the flat 

 cattle range surrounding 

 the base of the masts 

 make the automobile 

 practicable, and the ma- 

 chine is more reliable 

 and insures more steadi- 

 ness in the ascent than a horse. The plant 

 has nine of these great tubular steel 

 masts, so that considerable work aloft is 

 necessary. 



The other end of the cable is fastened to a 

 moving automobile which is hoisting the jack 

 three hundred feet to the top of the mast 



