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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.
Envisagement of the worst at its blackest being part of the holy duty of self-preservation, Victor sat fully dressed, with every other provision made for flight at the first flash of warning, only waiting to make sure, and with what impatience was apparent in the working of paste-coloured features, the wincing and shifting of slotted eyes, the incessant shutting and unclosing of tensed fingers.
L is the surface of the road, and SS are the sleepers, CC are the chairs which hold the angle iron, AA forming the longitudinally slotted center rail and the electric lead, which consists of two half-tubes of copper insulated from the chairs by the blocks, I, I. A special brass clamp, free to slide upon the tube, is employed for this purpose, and the same form of clamp serves to join the two ends of the copper tubes together and to make electric contact.
The slotted cross is here fixed, and the pins, R and P, sliding respectively in the vertical and horizontal lines, control the motion of the bar which carries the pencil, S. At first glance there would seem to be nothing here resembling wheel works.
I grasped the handle of the Perfect Automatic, stretched with our united strength, and pushed down on the lever. The spring-hammer drew back, a little trap or mouth at the end of the slotted tin barrel opened for the tack, the tack jumped out, turned over, landed point downward upon the right spot in the carpet, the crouching hammer sprang, and
Watching him with this thought in mind, one could almost credit old tales of beasts bewitched and walking in human guise. Near by he paused, alertly poised, prepared to spring. The slotted black eyes glimmered malignantly. His lips drew back in mockery from his teeth.
It was of the slotted drum type, he at once perceived, built up of laminations of soft steel painted to break up eddy currents, and as he tested the soft amber mica insulation about the commutators of hard-rolled copper, he knew that the defective generator could be repaired in three-quarters of an hour.
Three hundred years ago della Porta knew the camera obscura, and but for the lack of a sensitive plate would have made photographs. A box, thoroughly light-tight, slotted inside to receive plates, covered with black, and glued tight, a needle hole made by a number 10 needle in a thin sheet of paper and you have the apparatus for lensless photography.
A spiral steel spring, indicated in section by a number of black dots, presses at the top against the adjustable collar F, and at the bottom against C. The two weights WW are pieces of brass bar slotted for driving on to DD, which taper gently towards the outer edge.
When the composition of the line is completed, the assembling elevator G is raised and the line is transferred, as indicated by dotted lines, first to the left and then downward to the casting position in front of the slotted mold seated in and extending through the vertical wheel K, as shown in Figs. 2 and 3.
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