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Tom was altering his position every few minutes now, but none of his changes brought repose nor any small trifle of comfort. Do they tally?" The foreman responded: "Perfectly." "Now examine this pantograph, taken at eight months, and also marked A. Does it tally with the other two?" The surprised response was: "NO THEY DIFFER WIDELY!" "You are quite right.
The fixed pivot is situated at d, and pencil and pointer holes are made at a and f. Using the Pantograph. When adjusting the instrument for reduction or enlargement, make sure that the adjustment pivots are in the holes corresponding with the scale. The fixed pivot, pointer, and pencil must be rigid, and, with pivot c, be of such a length that the pantograph as a whole moves parallel to the paper.
If a same-sized copy is desired, the fixed pivot is transferred to d, and the pencil and pointer placed at a and f respectively. Construction of an Enlarging and Reducing Pantograph. Cut out of 1/8-inch oak, walnut, or beech four rods 5/8 inch wide and 19 inches long. Smooth them well all over, and make marks near the ends of each, exactly 18 inches apart.
They, too, exactly copy each other, but the patterns are quite different from A's, you observe. I shall refer to these again presently, but we will turn them face down now. "Here, thrown up ten sizes, are the natal autographs of the two persons who are here before you accused of murdering Judge Driscoll. I made these pantograph copies last night, and will so swear when I go upon the witness stand.
A little sliding weight to place on the rod near the pencil will be found useful for keeping the pencil point in constant contact with the paper. If the apparatus works stiffly, ease the holes a trifle and lead-pencil the wood at all points where two surfaces rub. It is absolutely impossible to make a good reproduction with a stiff, jerky pantograph.
At d is needed a hollow pivot, fashioned out of a quarter of an inch of pencil-point protector or some other thin tube, burred over slightly at the ends so as not to fall out. The end of B at f has a slotted hole to grip the pencil or pointer, as the case may be. A Same-size Pantograph.
"Now then," said Wilson, "I have here the natal autographs of the two children thrown up to ten times the natural size by the pantograph, so that anyone who can see at all can tell the markings apart at a glance. We will call the children A and B. Here are A's finger marks, taken at the age of five months. Here are B's at five months, and also at seven months.
Sometimes he copied on paper the involved and delicate pattern left by the ball of the finger, and then vastly enlarged it with a pantograph so that he could examine its web of curving lines with ease and convenience.
A very neat application of this principle is found in Villa's Pantograph, of which a full description and illustration was given in SCIENTIFIC AMERICAN SUPPLEMENT, No. 424; the racks, moving side by side, are the sun-wheels, and the planet-wheels are the pinions, carried by the traveling socket, by which the motion of one rack is transmitted to the other.
He did these pantograph enlargements on sheets of white cardboard, and made each individual line of the bewildering maze of whorls or curves or loops which consisted of the "pattern" of a "record" stand out bold and black by reinforcing it with ink.
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