Motography (Apr-Dec 1911)

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174 MOTOGRAPHY Vol. VI, No. 4. he as close together as possible. If the condensers are properly selected the result will be a perfect white light all Over the picture and the objectionable blue spot which is productive of so much criticism for the operator, is entirely eliminated. While the shutter is sent out approximately adjusted, this important detail does not require particular attention. There is a knurled knob on the lamphouse side of the mechanism just below the automatic shutter. As soon as the picture is on the screen, if there is any perceptible ghost, by turning this knob to the right or the When running new films through a projecting machine it often happens that the emulsion sticks to the trap door springs in long streaks and it is very difficult to remove the emulsion after it has become hard. In the Simplex it is only necessary to push the knob that opens the film trap door, grip the door, and lift it up to the stop, then pull forward away from the machine and this gives ample room to clean the trap. The door can be cleaned while being held in the hand. Not only is the Simplex a model of practicability and an example of high inventive genius, but it is con Fig. 5. Head with Covers Removed Fig. 6. Rear View with Door Open. Fig. 7. Head with Shutter Lease left, by means of the left hand, the shutter is brought into perfect alignment while the machine is in motion. This arrangement is a great help to the operators, both experienced and inexperienced, as it enables them to control this delicate adjustment while the machine is in motion. structed of the finest material and the highest grade of workmanship, regardless of cost. So strong is the faith of the manufacturers in this policy that they guarantee for one year to furnish any part that may be needed or that may be accidentally broken. Optics of the Projector By Arthur S. Newman* THE OPTICAL CENTER. THE projector is an optical instrument — not a delicate one dependent for its results upon very critical and exact adjustment, as in the case of a microscope, spectroscope, or astronomical telescope — but, nevertheless an instrument of sufficient delicacy to need attention to several small points, to insure getting the best results of which it is capable. In making the statement that as an optical instrument it is not to be classed among the delicate ones, I mean that maladjustment to the extent of one or two hundredths of an inch may not affect the performance to a noticeable degree; at the same time it must be understood that exact and critical adjustment of any optical instrument is always reqtrired to insure the very best effect. Nearly all apparatus dealing with optical phenomena have in them an imaginary line called the "optical center," and the projector is no exception to this rule. The operator who has the excellence of his performance at heart, should test the correctness of the *From the Bioscope, London, England. optical center of his apparatus, for on the exactness of the adjustment of the condenser gate and the various lenses mtich depends. If not perfect in this respect it may be found difficult to get the screen evenly illuminated ; or impossible to focus both sides of the picture, or the top and bottom at one and the same time. A very few years ago many projects were very defective in their "centering," but nowadays much more attention is paid to detail, and it is rarely one meets with a new projector having its optical parts not properly centered. When a machine has been some time in use, and perhaps has needed repairing, or has had to be sent from place to place several times, it is quite likely that a blow or a jerk may have put it out of adjustment to some extent, and it is advisable to test the correctness of the centering. The lantern slide attachment (especially on those machines which swing on a pivot, and are --^t*""'1 Ky an adjustable block of brass) is most frequ v nd to be out of center; in fact it is rarely t ound quite cor rectly placed, principally, p< utse this adjust ment is left to the operator, who lerally does not