The Optical Magic Lantern Journal (April 1895)

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70 The Optical Magic Lantern Journal and Photographic Enlarger. A New Ready Reference Table. (Rights Reserved.) REFERENCE TaBLEs hitherto published have been based on the assumption that the slides used are fitted with mounts having a circular opening 3 in. in diameter, a size which is fast becoming obsolete. The following table is for the size of opening now usually met with, viz., a cushion shape 23 in, by 22 in., and has been specially compiled for The Oprican Magic LANTERN JOURNAL by Mr. G. Hastings Philp. gos He FOCUS OF LENS IN INCHES. e3| 6 7 8 9 10 WU e228 oe ce Ag Size oF Preturr. ft. in, ft. in. | ft. in, ft. in. ft. in. ft. in. 16 | 611] 511; 5 2] 4 7) 4 2: 3 9 16 7 4164] 5 6! 411; 4 5: 40 17 7 9} 6 8} 510] 5 2} 4 8! 4 8 18 8 3} 7 1] 6 2/1 5 6] 411] 4 6 19 8 9| 7 G6! 6 7] 510} 5 3] 4 9 20 | 9 2/ 710} 611! 61. 5 6) 5 0! 22/10 1; 8 8:17 7) 6 9) 61) 56) a (ll 0) 9 5) Bel Y al 67! 6 oF 26 ;11 11/10 3) 9 0| 711! 7 2' 6 6 28 |1210/]11 0 28) 8 9) 7 O47 | 80 |138 9]1110/10 4; 9 2: 8 3) 7 6! 35 }16 1/13 9;12 0;10 8' 9 8! g 9; 40 [18 4/15 9/13 9112 3.11 0/10 0: 45 )20 8/17 9/15 6)13 9/12 5/11 3. 50 | 2211/19 8/17 3/15 3:13 9/12 6) 55 | 25 3/21 8/19 0:1610/115 2:13 9/ 60 | 27 6} 23 7120 8.18 4116 Gf 15 0 | + i i 12 13 14 15 16 17 Sem ses gs | 40 | 9 2; 8 6! 710] 7 4; 611 6 6) 42 9 8! 811, 8 3:7 8| 7 3! 6 9! 44/10 1) 9 4! 8 8: F714! a7, 7 1; 46 110 7} 9 9! 9 0! § 5] Gill 75 48 /11 0}10 2} 9 5] 810! 8 3/ 7 9 50 ;11 6/10 7! 910] 9 2! § 7] gq. 55 | 12 7/11 8:1010!10 1; 9 6! guy 60 138 9/12 9!11 9;11 0:10 4 9 8) 65 |1411}13 9/12 91:1111;11 2/10 6! 70 }16 1]1410!13 9:-1210]12 o!11 4 75 |17 2})1511'14 9,13 y}/1211/]]9 9 80 |18 4;1611/15 9}14 8/13 9/1211 85 |19 6/18 0/16 8/15 7!14 7/13 9 90 |}20 §|19 1/17 8116 6/15 6/14 7 95 | 21 9!20 1'18 8]17 5/16 4/15 4 100 | 2211:21 2 19 8/18 4/17 3 16 2 | H Lecture Notes. By a Lantern Lecturer. Tue fact that hardly a single number of this journal has been issued of late without containing a contribution of one kind or another bearing on the subject of the decadence of lantern lectures, conclusively shows that there must be many who are dissatisfied with the present position, and the outlook for the future, of lantern entertainments. Amongst these contributions, Mr. Taunt’s letter in the December journal goes to the root of, and sums up, the whole matter. The budding lecturer should learn it off by heart before he ventures to maka his first appearance in public, There is an old saying that ‘every Englishman believes that there are three things he could do properly if he tried—poke a fire scientifically, drive a dogcart, and write a novel.” To this trio « give a lecture’ might be safely added. It is the commonest occurrence for a lecture to be given by some individual who, whatever his other attainments, is utterly without experience in this particular matter. Success under such circumstances can never be anything but hazardous ; in nine cases out of ten the result is failure, more or legs defined, and a further permanent injury inflicted on lantern work. Let the would-be lecturer bear in mind that the public speaker is, as a rule, made and not born. Professor Huxley, the greatest living master of English prose, and an ideal lecturer, has confessed that at the beginning of his career, public speaking gave him the utmost difficulty, and that he was once unable to express his ideas in suitable language. The assumption may safely be ventured that his present incisive, _ clear and inimitable style is the outcome of ' work and care bestowed upon it. With such an example as this before him, no amateur lecturer should venture to appear in public * until he has done his utmost in every : Way to make the most of his abilities and attainments, One of the surest aids to successful results in lecturing is the use of notes. Unfortunately, there is a prejudice against them; an audience 1s Supposed to value more highly and to better appreciate a discourse which is entirely extempere, and is unaided by mechanical assistance of any sort. No doubt this prejudice does exist to a certain extent, but it is equally certain that it Oes its existence not to the use but rather to the misuse of notes. Nothing can be more ; annoying to the nerves of an andience than the lecturer who is not master of his notes, All