Young Thomas First Rough Demonstration (2 results)

Hardcover. Condition: Very Good.   YOUNG, Thomas. "The Bakerian Lecture: Experiments and Calculations Relative to Physical Optics" in Philosophical Transactions of the Royal Society of London, Bulmer & Co., 1804, vol 94 pp. 1-16, in the full issue of vi, (ii), 432, (6)pp, 8 plates, containing parts I and II, 310x255mm, complete. This is in the I think original binding, or at the very least a contemporary binding: plain, rustic paper boards, with what I think is a paper spine over an original linen spine cover, the whole of which seems to be very stoutly reinforced as such this is a very unusual binding for the Phil Trans in my long experience. There is a bookplate for the original owner (I assume) "Eaton Neston Library", which was a very large library in a very large (37-room) country house in Northamptonshire. Almost the entire text is unopened, and fresh, and with very ample margins. VG copy in its ORIGINAL STATE. [++] The paper offered here is the third of three great papers written between 1800-1803 (and presented 1801-1804) on the nature of light, reviving "the wave theory of light propagation through his discovery of the principle of interference" rejecting the particle theory of light in "favor of his explanation of light as a wave in the universal ether."--Claire Parkinson, Breakthroughs, Young 1801-1804. In Young's Bakerian Lecture to the Royal Society on November 12, 1801, On the Theory of Light and Colours. He provided a comprehensive theory of the wave properties of light. In a follow-up paper to the Royal Society which was presented in July 1802, Young (one of the great Everything People of the 19th century, a polymathic polymath of the highest order) introduced a new observation: bands of colors appearing when light goes around a fine fiber or hair. Young cut a small hole in a piece of cardboard, and fixed the fiber across the center of the hole. Looking at a distant light source through the hole, he saw colored bands of light on either side of the fiber, parallel to it. He interpreted these colors as arising from interference between light waves that pass on opposite sides of the fiber."--Skulls in the Stars, online, "Thomas Young Sees the Light. [++] In his Bakerian lecture in November of 1803 and printed 1804 [the paper offered HERE] Young presented his strongest case for the interference of light. [++] "It would be the first rough demonstration of what later became known as Young s double slit experiment or Young s two-pinhole experiment. In this rough implementation, Young poked a small hole in a window shutter to allow a thin beam of sunlight to enter his room. In the path of that beam, he placed a thin piece of card, one thirtieth of an inch thick, dividing the beam into two parts, each of which spreads into the path of the other. The combined light wave is then projected onto a screen some distance beyond, allowing the multiple colored fringes to be seen in the shadow cast by the card. This, Young felt, was conclusive proof of the wave nature of light."--ibid. It should be remembered that Young met resistance in the living and the dead (like Brewster, Brougham, Newton, and the particle people) and didn't really find acceptance until rescued (too harsh a word) from obscurity after a dozen years or so by Fresnel and later by Helmholtz. Also in this volume is Count Rumford's very long (pp 77-182) "An Enquiry concerning the Nature of Heat, and the Mode of its Communication". Also: William Herschel, "Continuation of an Account of the Changes that have happened in the relative Situation of double Stars", and several other papers.

Hardcover. Condition: Fine. YOUNG, Thomas. "The Bakerian Lecture: Experiments and Calculations Relative to Physical Optics", in the Philosophical Transactions of the Royal Society of London, 1804, volume 94 part I and II, vi, 434, 26pp, (part II beginning after (iv) pp(191)-434. 265mm. Beautifully rebound in calf-backed and calf-tipped boards. The non-leather parts have been skillfully and ably lightly antiqued so that the volume doesn't look surprisingly brand-new. Excellent craftsmanship. [++] This is in the original I think binding, or at the very least a contemporary binding: plain, rustic paper boards, with what I think is a paper spine over an original linen spine cover, the whole of which seems to be very stoutly reinforced as such this is a very unusual binding for the Phil Trans in my long experience. There is a bookplate for the original owner (I assume) "Eaton Neston Library", which was a very large library in a very large (37 -room) country house in Northamptonshire. Almost the entire text is unopened, and fresh, and with very ample margins. VG copy in its ORIGINAL STATE. [++] The paper offered here is the third of three great papers written between 1800-1803 (and presented 1801-1804) on the nature of light, reviving "the wave theory of light propagation through his discovery of the principle of interference" rejecting the particle theory of light in "favor of his explanation of light as a wave in the universal ether."--Claire Parkinson, Breakthroughs, Young 1801-1804. In Young's Bakerian Lecture to the Royal Society on November 12, 1801, On the Theory of Light and Colours. he provided a comprehensive theory of the wave properties of light. In a follow-up paper to the Royal Society which was presented in July 1802, Young introduced a new observation: bands of colors appearing when light goes around a fine fiber or hair. Young cut a small hole in a piece of cardboard, and fixed the fiber across the center of the hole. Looking at a distant light source through the hole, he saw colored bands of light on either side of the fiber, parallel to it. He interpreted these colors as arising from interference between light waves that pass on opposite sides of the fiber."--Skulls in the Stars, online, "Thomas Young Sees the Light. [++] In his Bakerian lecture in November of 1803 and printed 1804 [the paper offered HERE] Young presented his strongest case for the interference of light. [++] "It would be the first rough demonstration of what later became known as Young s double slit experiment or Young s two-pinhole experiment. In this rough implementation, Young poked a small hole in a window shutter to allow a thin beam of sunlight to enter his room. In the path of that beam, he placed a thin piece of card, one thirtieth of an inch thick, dividing the beam into two parts, each of which spreads into the path of the other. The combined light wave is then projected onto a screen some distance beyond, allowing the multiple colored fringes to be seen in the shadow cast by the card. This, Young felt, was conclusive proof of the wave nature of light."--ibid. It should be remembered that Young met resistance in the living and the dead (like Brewster, Brougham, Newton, and the particle people) and didn't really find acceptance until rescued (too harsh a word) from obscurity after a dozen years or so by Fresnel and later by Helmholtz.[++] Also in this volume is Count Rumford's very long (pp 77-182) "An Enquiry concerning the Nature of Heat, and the Mode of its Communication". Also: William Herschel, "Continuation of an Account of the Changes that have happened in the relative Situation of double Stars", and several other papers.  .