THREE:A planing machine invented by Mr Bodmer in 1841, and since improved by Mr William Sellers of Philadelphia, is free from this elastic action of the platen, which is moved by a tangent wheel or screw pinion. In Bodmer's machine the shaft carrying the pinion was parallel to the platen, but in Sellers' machine is set on a shaft with its axis diagonal to the line of the platen movement, so that the teeth or threads of the pinion act partly by a screw motion, and partly by a progressive forward movement like the teeth of wheels. The rack on the platen of Mr Sellers' [134] machine is arranged with its teeth at a proper angle to balance the friction arising from the rubbing action of the pinion, which angle has been demonstrated as correct at 5°, the ordinary coefficient of friction; as the pinion-shaft is strongly supported at each side of the pinion, and the thrust of the cutting force falls mainly in the line of the pinion shaft, there is but little if any elasticity, so that the motion is positive and smooth.
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THREE:
THREE:California? So I was. But one of my air liners brought me across in record time.There was a smell of tobacco in his room and a vision of Lawrence with his heels on the mantelpiece smoking a cigarette. He was looking at a paragraph in an early edition of the Globe that seemed to give him satisfaction.
THREE:I had also to promise the major that on my return I should bring with me a copy of De Tijd in which all I had experienced and seen in Bilsen was described, and also a box of Netherland cigars, which he promised to pay for; then I was allowed to go.