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

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6ofocus ? Doubtless many more questions will arise, but these mentionedwill be of the most importance. It is a " rule of thumb " practice for anoperator to wheel his apparatus up and down a room in order to findthe desired position from which to operate ; and the minds of anyspectators will not be confirmed in the idea that the exhibitor thoroughlyunderstands his business. How very much more simple and satisfactoryis it to reason thus before starting for the place of entertainment. Ascreen of — ft. diameter is required, so if I bring a lens of — focus thelantern must be — ft. from the screen, the length of the room being ofcourse taken into consideration in order to ascertain that it is possibleto erect the lantern at the desired distance. This having been ascertainedbeforehand, all that is required is to take an objective of thedesired focus and measure off the necessary space between the screenand the place where the lantern should be set.Supposing we are called upon to operate the lantern in a hall 25ft. inlength, we first ascertain the size of disc required, which we will supposeto be I oft. With an objective having a focus of 6in., how far from thescreen must the lantern be placed in order to produce a loft. disc ?Here is the rule by which it can be ascertained : -Let A = focus of objective.„ B = diameter of slide.,, V^ =,, ,, QISC.,, D = distance between the lantern and screen.Multiply the diameter of the circle round (C) by the focus of the lens(A), and divide by the diameter of the slide (B).C X A 10 X 6^ D =B 3= 20ft.It is thus seen that in order to produce a loft. disc with a 6in.objective, the lantern must be placed 20ft. from the screen. On theother hand, we may possess several lenses of different foci, and it isnecessary that the screen and the lantern must occupy certain positionswhich we will suppose to be just 20ft. apart, and that the diameterof the disc must be loft. How are we to ascertain whether we must usea lens of 4, 5, 6, 7, or other number of inches in focus ?Multiply the distance between the lantern and the screen (D) by theopening of slide (B) and divide by the size of disc.D X B 20 X 3A focus of lens = = 6in. focus.Again :WeC 10have a lens of 6in. focus, and intend that 20ft. shallintervene between the lantern and the screen, and wish to know what
—6isize of disc can be produced. In order to calculate this it is necessarythat we multiply the distance between the lantern and the screen (D) bythe size of slide opening (B) and divide by the focus of the lens used (A),which gives usD X B 20 X 3= C size of disc = = loft. diam, of disc.A 6The following Ready Reference Table has been computed by theforegoing rule, and by a glance it will show the relations between lanternand disc with object-glasses of every focus from 4in. to isin.READY REFERENCE TABLE.DistancebetweenLanternand Screen.
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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
Page 24 and 25: i6aid of two screws. The two slots
Page 26 and 27: perfection, combustion, and purity,
Page 30 and 31: 20back of lantern, in that case the
Page 32 and 33: sumed, the flow should be adjusted
Page 34 and 35: 24which is passed over the rod, and
Page 36 and 37: 26gases to be shut off without dist
Page 38 and 39: 28made in their get up. We have nev
Page 41 and 42: 3tserve to distribute the same to t
Page 43 and 44: (V>ao—IH
Page 45 and 46: ;33the thing a study, and used such
Page 47 and 48: V>-is:a
Page 49 and 50: 35who designed the body of this lan
Page 51 and 52: 37far back but equally flat to the
Page 53 and 54: 39ceding one, therefore giving grea
Page 55 and 56: 4tthe same as they do, in fact it i
Page 57 and 58: —43reducing same as low as possib
Page 59 and 60: 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: 59small diameter as through an obje
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 and 112: 97opposite side to that which he is
Page 113 and 114: 99without doubt, this is the only t
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
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oils have to be substituted simply
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1^3Fig. 54.A cheap but none the les
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115Directions.— Having thoroughly
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117objectives which will not give s
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119is immersed, then as the water e
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12Ireadily splits up by cleavage) a
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123particular kind of structure und
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125the complementary colour to red
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127of a combined microscope and pol
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129without this defect is well nigh
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131diameter, and focus, the general
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133The loss of light is not so grea
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135cheap as circular pattern, but t
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^37A variety of subjects may be tre
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—139on an average far superior re
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—141development, immerse in the f
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143Hydrokinone.Solution I. Solution
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—145Add r drop of solution of Bro
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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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