The Art of projection and complete magic lantern ... - Yesterday Image

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98of the slide, it will occupy the centre of condenser and thus ensureregistration. Its working is wonderfully simple, and it has no levers orcatches to get out of order.Fig. 5:Fig. 53-Docwra Carrier.—The best has been left until last, although theorder of previously mentioned carriers are not according to their respectivemerits. Slides to receive the full benefit of this carrier should bemounted without mats or masks, if it is necessary to use these, let thembe very narrow, not more than --^ wide, to prevent the painting or filmtouching the cover glass.The front of this carrier has a brass plate let into the wood-work, outof which is cut the cushion or circle in the said plate ; a special tool hasbeen made to cut each and everyone exactly true to a minimum and
99without doubt, this is the only true method by which a series of photographsmay be made to register dead true, only those who have tried cancomprehend the almost hopeless task of trying to make slides with cushionmats to superimpose, the slightest strain on any one side of the matbeing sufficient to throw it out of the square ; with circular mats there isnot quite so much trouble, even then, if exactness is required each slidemust be blocked, a difficulty which these carriers overcome.The Docwra carrier is so constructed that either square or circularpictures can be placed on the screen with such dead accuracy that nocritical observer will see where the one begins and the other leaves thescreen. The mechanical parts are so arranged, that by compressing aprojecting button the slides are gripped automatically and held firmlyagainst the front of the carrier, to ensure each picture being in focus,and are so geometrically true that perfection is attained which cannotbe accomplished by any other means.A is the thumb press that presses the clips back which hold the slide inposition, to place a slide in the carrier hold it at a slight angle, with thebrass face undermost, drop the slide into its place, pressing the spring atthe same time, by this means the slide is held firmly in position andpressed to the front of the frame; to make sure of the slide being down onto the bed of the frame, always press the spring once or twice in succession.B is the regulating stop, for adjusting the distance the frame shall gointo lantern, as it presses against the lantern stage.SCREENS.A great deal of the result is dependent upon the screen, it should hangperfectly flat, and be of snowy whiteness. Many an exhibitor will sacrificehis light by using a screen of a yellowish or dirty nature, in fact beforenow, a domestic sheet from the bed room has done duty as a screen.The best screen for general purposes, especially for travelling, is of a linentexture, scrupulously white and above all very thick and strong, especiallyfor the larger sizes, the thickness gives it opacity, and the strength preventsthe risk of splitting, the corners should be strengthened with an extralayer of strong linen. In the large sheets there is a very great strain onthese corners, some are made with eyelet holes along thetop and sides,others with rings along the top and tapes along the other three sides.prefer the latter, it is entirely a question of use, as many exhibitors preferthe eyelet holes. A public exhibitor usually has three screens, 12, 16,20 feet, as it is not always possible to use the larger screens, even in largeG2We
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THEPROJECTIO,MA GIC LANTERN MANUAL
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OCSBLIBRAPY
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..INDEXA.Adjustment of a JclAlumini
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—increased by the aid of a powerf
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far back as 1811. Lanterns of the a
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mixadvisable to have a mahogany, or
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8A condenser can only take those ra
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There is a considerable difference
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12occasions, it is only necessary t
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14Triplexicon was first made it was
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i6aid of two screws. The two slots
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perfection, combustion, and purity,
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20back of lantern, in that case the
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sumed, the flow should be adjusted
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24which is passed over the rod, and
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26gases to be shut off without dist
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28made in their get up. We have nev
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3tserve to distribute the same to t
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(V>ao—IH
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;33the thing a study, and used such
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V>-is:a
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35who designed the body of this lan
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37far back but equally flat to the
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39ceding one, therefore giving grea
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4tthe same as they do, in fact it i
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—43reducing same as low as possib
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45With all three discs, as coincide
Page 61 and 62: 47and the slides may be placed in a
Page 63 and 64: 49inch and inch and-a-half screws,
Page 65 and 66: SIshowing, gently push back the cov
Page 67 and 68: 53sun rising and illuminating the p
Page 69 and 70: 55large slides it was necessary to
Page 71 and 72: 57A. Is a right angle prism, being
Page 73 and 74: 59small diameter as through an obje
Page 75 and 76: —6isize of disc can be produced.
Page 77 and 78: —63COMPRESSED GASES.Compressed ga
Page 79 and 80: 6sNO DANGER WITH GAS CYLINDERS,OR B
Page 81 and 82: "67valves are of little use as a me
Page 83 and 84: 69to reach our compressors without
Page 85 and 86: ——71ascertain their bursting po
Page 87 and 88: —73bottles black, and hydrogen (o
Page 89 and 90: ;Having blown through every tube to
Page 91 and 92: 77controlling the flow of compresse
Page 93 and 94: 79The Duplex.—The chieffeaturecon
Page 95 and 96: —8icarries the gas to the orifice
Page 97 and 98: 83the above-mentioned tube, whilst
Page 99 and 100: 8sTable for Ascertaining the Quanti
Page 101 and 102: 87On no account use two separate bo
Page 103 and 104: 89virtue, and if required to be use
Page 105 and 106: 91In finishing up, turn out the hgh
Page 107 and 108: 93good support in one sense— but
Page 109 and 110: 95another takes its place without a
Page 111: 97opposite side to that which he is
Page 115 and 116: lOIFig 56.SCREEN FRAMES.Considerabl
Page 117 and 118: I03and hauled up. The pulley blocks
Page 119 and 120: PRACTICAL HINTS TO INTENDING LECTUR
Page 121 and 122: 107as well as the lecturer, a syste
Page 123 and 124: 109Fig. 57- Fig. 58.READING LAMP.A
Page 125 and 126: oils have to be substituted simply
Page 127 and 128: 1^3Fig. 54.A cheap but none the les
Page 129 and 130: 115Directions.— Having thoroughly
Page 131 and 132: 117objectives which will not give s
Page 133 and 134: 119is immersed, then as the water e
Page 135 and 136: 12Ireadily splits up by cleavage) a
Page 137 and 138: 123particular kind of structure und
Page 139 and 140: 125the complementary colour to red
Page 141 and 142: 127of a combined microscope and pol
Page 143 and 144: 129without this defect is well nigh
Page 145 and 146: 131diameter, and focus, the general
Page 147 and 148: 133The loss of light is not so grea
Page 149 and 150: 135cheap as circular pattern, but t
Page 151 and 152: ^37A variety of subjects may be tre
Page 153 and 154: —139on an average far superior re
Page 155 and 156: —141development, immerse in the f
Page 157 and 158: 143Hydrokinone.Solution I. Solution
Page 159 and 160: —145Add r drop of solution of Bro
Page 161 and 162: 147crystal varnish, some red sable
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149boiled oil to the medium. Perfec
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;151sienna to impart warmth without
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iS3front glass injuring the paintin
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155Fig 73-Fig 74.handle to which th
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;157follows :—one end of the fram
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159on any slide providing it is dar
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i6iTrough, which consists of two gl
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—i63It is advisable to fill the t
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i65matter on the surface of the pur
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—167planation we have indicated i
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169single light box is very mislead
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ADVERTISEMENTS.
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ADVERTISEMENTS. 173HAZELL, WATSON,
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ADVERTISEMENTS.I75Brilliant Effect.
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;ADVERTISEMENTS.ILIFFE & SOIL'SP HO
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ADVERTISEMENTS. 179ENORMOUS SUCCESS
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ADVERTISEMENTS.HUGHES' NEW PATTERN
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ADVERTISEMENTS. 183RussianJronJLamp
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TheADVERTISEMENTS. 185THE GRIND BIU
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nothingADVF.RTISE^[E^TS.iS7HUGHES'H
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THE MINIATURE MALDEN TRIPLE.HUGHES'
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No. 1 Lantern.THE: UNIVERSALMAGICLA
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!ADVERTISEM ENTS.Hughes' Special Pa
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:ADVERTISEMENTS. 191To Lecturers an
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ADVERT iSF.MENTS.1^3I^ ANTERNNEGATI
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ENGLANDSLANTERNAREPLATESUNSURPASSED
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A 000 618 714
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