Electrical and magnetical experiments.- v. 4. Experiments in pneumatics, hydrology, and pyrotechnics, with an appendix of miscellaneous recreationsL. Davis, 1774 |
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Ergebnisse 1-5 von 21
Seite 9
... most eligible . Some operators line their globes or cy- linders with wax , or fome other electric fubftance ; which in large globes may be of good ufe ; but when they are fall , no material advantage can be expected from any lining ...
... most eligible . Some operators line their globes or cy- linders with wax , or fome other electric fubftance ; which in large globes may be of good ufe ; but when they are fall , no material advantage can be expected from any lining ...
Seite 12
... most remote from the globe should be round , and much larger than the reft for the effort of the electric matter to fly off , is always the greatest at the greatest distance from the globe ; and from that part the longest and ftrongest ...
... most remote from the globe should be round , and much larger than the reft for the effort of the electric matter to fly off , is always the greatest at the greatest distance from the globe ; and from that part the longest and ftrongest ...
Seite 17
... most powerful ex- citer is a little amalgam , made by rubbing mercury and thin pieces of lead or tinfoil together , in the palm of the hand . If a rubber be at any time placed perpen- dicular to the horizon , it will be necessary to use ...
... most powerful ex- citer is a little amalgam , made by rubbing mercury and thin pieces of lead or tinfoil together , in the palm of the hand . If a rubber be at any time placed perpen- dicular to the horizon , it will be necessary to use ...
Seite 23
... most formidable part of the elec- tric apparatus is the coated glass , used in the Leyden experiment and the battery . The form of the glafs is immaterial with refpect to the shock ; but for different ex- periments both plates and jars ...
... most formidable part of the elec- tric apparatus is the coated glass , used in the Leyden experiment and the battery . The form of the glafs is immaterial with refpect to the shock ; but for different ex- periments both plates and jars ...
Seite 25
... most effectual method of charging a jar , is to connect the outfide , by means of wires , with the rubber , while the wire , proceeding from the infide , is in contact with the conductor . In this manner the infide of the jar will be ...
... most effectual method of charging a jar , is to connect the outfide , by means of wires , with the rubber , while the wire , proceeding from the infide , is in contact with the conductor . In this manner the infide of the jar will be ...
Häufige Begriffe und Wortgruppen
againſt anſwer attracted axis baked wood battery bottom brafs braſs cafe cards compofe conductor confederate conftruction correfpond cylinder defcribed defire dial diameter dice diſcharge diſtance divifions eafily elec electricity electrified etwees exploſion expreffed faftened fame fecond feven fhock fhould fide figure filk fimilar fire firen firft firſt fize fmall fome four fouth pole fparks fquare ftand ftop ftring ftrongly fuch furface glafs glaſs globe half an inch hole hollow inches inches long infide infulated itſelf kite long card magical game magnetic bar magnetic table metal moſt muft muſt north pole obferve oppofite pafs pafteboard circle perfon perſpective piece pivot placed Plate pleaſe pofition poſition prefent previouſly queſtion RECRE RECREATION round rubber ſmall ſpark ſtand ſtop tablets thefe theſe thofe thoſe tin-foil touched needle tourmalin tricity tube turn uſed vafe vaſe wheel wire words
Beliebte Passagen
Seite 82 - To the top of the upright stick of the cross is to be fixed a very sharp-pointed wire, rising a foot or more above the wood. To the end of the twine next the hand is to be tied a silk ribbon, and where the silk and twine join a key may be fastened.
Seite 62 - Two small hemispheres of wood are then fixed with cement to the middle of the upper and under sides, centrally opposite, and in each of them a thick strong wire eight or ten inches long, which together make the axis of the wheel. It turns horizontally on a point at the lower end of its axis, which rests on a bit of brass cemented within a glass salt-cellar. The...
Seite 100 - PROVIDE a glass cylinder, three feet long, and three inches diameter ; near the bottom of it fix a brass plate, and have another brass plate, so contrived that you may let it down the cylinder, and bring it as near the first plate as you desire. Let this cylinder be exhausted and insulated, and when the upper part is electrified, the electric...
Seite 85 - ... fo near, and called aloud to all the company to retire, as he did himfelf about two feet. THINKING himfelf now fecure enough, and not being incommoded by any body very near him, he took notice of what...
Seite 238 - ... he thinks proper, then to close the box, and, if he please, to wrap it up in paper, seal it, and give it to you. Then placing the board with the pyramid upon it, you immediately tell him the order in which the tablets are placed, by reading the words to which the needles on the circles point. INTERESTING EXPERIMENTS WITH THE AIR PUMP.
Seite 56 - ... can touch the face of the king without danger, which he pretends is a test of his loyalty. The Cup of Tantalus. You place a cup of any sort of metal on a stool of baked wood or a cake of wax. Fill it to the brim with any liquor; let it communicate with the branch by a small chain; and when it is moderately electrified, desire a person to taste the liquor, without touching the cup with his hands, and he will instantly receive a shock on his lips. The motion of the wheel being stopped, you taste...
Seite 59 - ... wheel, it will attract the nearest thimble, and so put the wheel in motion ; that thimble, in passing by, receives a spark, and thereby being electrified is repelled, and so driven forwards ; while a second, being attracted, approaches the wire, receives a spark, and is driven after the first, and so on till the wheel has gone once round, when the thimbles before electrified approaching the wire, instead of being attracted as they were at first, are repelled, and the motion presently ceases....
Seite 63 - ... inches distance, with a thimble on the top of each. On the edge of the wheel is a small leaden bullet, communicating by a wire with the gilding of the upper surface of the wheel ; and about six inches from it is another bullet, communicating in like manner with the under surface. When the wheel is to be charged by the upper surface, a communication must be made from the under surface to the table.
Seite 55 - ... together, by which the picture will appear of a piece, as at first, only part is behind the glass, and part before. Hold the picture horizontally by the top, and place a little moveable gilt crown on the king's head.
Seite 109 - ... an hour . If after this, it be drawn through the hand either way, the light will be uncommonly intenfe, and, without the leaft interruption, from one hand to the other, even to its whole length. After this operation, which difcharges it in a great meafure, it will ftill flafh at intervals, though it be held only at one extremity, and quite ftill ; but if it be -grafped by the other hand at the fame time, in a different place, ftrong...