Helix

(noun.) type genus of the family Helicidae.

(noun.) a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle.

校对:帕蒂

• Such an arrangement of wire is known as a helix or solenoid, and is capable of lifting or pulling larger and more numerous filings and even good-sized pieces of iron, such as tacks. 伯莎M.克拉克. 科学通论.
• In fact, the helix will be found to behave in every way as a magnet, with a north pole at one end and a south pole at the other. 伯莎M.克拉克. 科学通论.
• One shell, the Helix pomatia, after having been thus treated, and again hybernating, was put into sea-water for twenty days and perfectly recovered. 查尔斯·达尔文. 物种起源.
• If the current is sent through the helix in the opposite direction, the north and south poles exchange places. 伯莎M.克拉克. 科学通论.
• If the magnet is passed through the helix, the current is reversed as soon as the magnet passes the middle point. Edward W. Byrn. 十九世纪发明进展.
• If the current could be repeatedly reversed just as the helix completed its half turn, the motion could be prolonged; periodic current reversal would produce continuous rotation. 伯莎M.克拉克. 科学通论.
• If the motor is to be used for continuous motion, some device must be employed by means of which the helix is capable of continued rotation around its support. 伯莎M.克拉克. 科学通论.
• This shows that the ends of the helix have magnetic power but not the sides. 伯莎M.克拉克. 科学通论.
• A helix through which current flows always points north and south, if it is free to rotate. 伯莎M.克拉克. 科学通论.
• The principle is the same if the magnet be made to approach and recede from the poles of an electro-magnet having a helix wound around a soft iron core. Edward W. Byrn. 十九世纪发明进展.
• Filings do not adhere to the sides of the helix, but they cling in clusters to the ends of the coil. 伯莎M.克拉克. 科学通论.
• Schweigger of Halle discovered that this deflecting force was increased when the wire was wound several times round the needle, and thus he invented the magnetising helix. 威廉·亨利·杜利特. 世纪发明.
• We saw in Section 296 that a coiled wire through which current was flowing would attract iron filings at the two ends of the helix. 伯莎M.克拉克. 科学通论.
• If the current is sent through the coil in the opposite direction, the two poles exchange positions and the helix turns until the new north pole points north. 伯莎M.克拉克. 科学通论.

埃伦校对