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6. The attractive force of plane conductors of a given area charged with a given quantity of electricity varies with the figure, being greater as the perimeter is greater. This force is therefore least when the area forms circle and greatest when it is extended into an indefinite right line. The perimeters being the same the attractive forces (intensities) are inversely as the areas.

The electrical capacities of a sphere or cylinder (that is the quantity which they can receive with a given intensity,) are the same as of the plane figures into which it may be supposed to be rectified.

[TO BE CONTINUED IN OUR NEXT.]

Mechanics' Register.

List of American Patents which issued in October, 1835.

Oct.

589. Double Speeder.-William Field, North Providence, Rhode Island, 590. Lampwicks, raising.-Samuel Rust, New York,

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591. Pelisse Wadding.-Stukley Turner, Cranston, Providence County, R. I. 592. Planing Boards, &c.-Reid R. Throcmorton, New York,

593. Fire Places.-Ebenezer S. Greely, Dover, Penobscot, Maine,

594. Clover Seed, &c. cleaning.—Moses Davenport, Philips, Somerset Co., Maine, 6 595. Silk-worms, rearing.-Gamaliel Gay, Poughkeepsie, New York,

596. Saw Mill.-Uri Emmons, New York.

597. Thrashing &c. Machine.-Russel Bradley, Williston, Vermont, 598. Spring Saddle.-Joel Woodward, Marshalton, Pennsylvania,

599. Stave and Shingle Machine.-John Everhart, J. Pearson, J. Morford and N. Everhart, Wayne, Ohio,

600. Alcohol from Apples.-Anson Wolcott, East Bloomfield, New York, 601. Ploughs.-William Walker, Washingtonville, Pennsylvania,

602. Caoutchouc, cutting.-William Atkinson, New York,

603. Ropes, laying.-John Goulding, Boston, Massachusetts,

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604. Hemp, &c. halcheling.-—John Goulding, Boston, Massachusetts, 605. Horse Power.-Moses Davenport, Philips, Somerset County, Maine, 606. Tin Baker.-Nathaniel D. Whitin, New York,

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607. Cooking Stove.-Elnathan Samson, St. Lawrence County, New York, 608. Clover Seed, &c. thrashing.-Asa Burgess and Herman Baldwin, Litchfield County, Connecticut,

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612. Rail-roads.-Roswell Bourne, Lancaster, Massachusetts,

609. Hydrostatics and Pneumatics.-R. Mills H. B. Fernald, City of Washington,
610. Washing Machine.-John O. Geer, Norwich, Connecticut,
611. Staves, cutting.-George Pack, Sullivan, New York,

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620. Springs of Carriages.-Henry Pace, Senr. Cincinnati, Ohio, 621. Lathe.-James Haven, Newport, New Hampshire,

617. Roads, constructing.—Thomas Earl, Burlington, New Jersey,
618. Cast-iron Window sash.-James S. Stoddard, Macedon, New York,
619. Canal Boats.-James O'Connor, Philadelphia,

613. Churn.-Asahel Bacon, Windsor, New York,

614. Rotary Steam Engine.-Arnold Buffum, Philadelphia, Pennsylvania,
615. Doffer for Wool Cards.-Stephen R. Parkhurst, Providence, Rhode Island,
616. Grates or Grate Bars.-Jordan L. Mott, New York,

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622. Rail-road Car.-George W. Cleaveland, Baltimore, Maryland, 623. Stove, or Furnace.-Denison Olmsted, New Haven, Connecticut.

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624. Gimblets and Augers.-Orville B. Percival, East Haddam, Connecticut,
625. Washing Machine.-Henry Ault, Philadelphia, Tennessee,
626. Fire Arms.-Samuel Ladd, Waltham, Massachusetts,
627. Felloes, cutting.-J. S. Brown and J. T. Barker, Philips, Maine,
628. Mill for Coffee, &c.-David Richmond, M'Arthurstown, Ohio,
629. Felloes cutting.--W. Braley and M. L. Worthley, Philips, Maine,
630. Bridges.-Richard T. L. Witty, Lowell, Massachusetts,

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631. Sparks, arresting.-Hunt C. Wiatt, Weldon, North Carolina, 632. Cooking Stove.-Horatio B. Wade, Cincinnati, Ohio,

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653. Coal Stove, Anthracite.-Eliphalet Nott, Schenectady, New York,

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64. Tanning, preparing Skins for.-J. C. F. Saloman, Reading, Pennsylvania,

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635. Steam Boilers.-J. C. F. Saloman, Philadelphia, Pennsylvania,

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656. Ploughs.-Jarius S. Tefft, Amherst, New York,

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637. Washing Machine.-Isaac Spicer, Norwich, Connecticut,

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638. Screw for Glass Knobs.—Orrin Newton, Pittsburg, Pennsylvania,

639. Cement for Cisterns, &c.-W. H. Carson and G. Roberts, York, New York,

640. Biscuit, &e. cutting.-T. Havener and T. H. Havener, Washington City,
641. Calendering Cloth.-Zenas Bliss, Johnston, Rhode Island,
642. Roofs, covering.—Phinehas Burgess, Brooklyn, New York,
643. Crackers, &c. cutting.-William R. Nivens, New York,

644. Feathers, cleaning.-George Reynolds, East Hartford, Connecticut,
645. Planing boards, &c.-Reid C. Throckmorton, New York,
646. Bricks and Tile.- Benton P. Coston, Sterling, Pennsylvania,
647. Surveyor's Compass.-Samuel R. Miller, Port Royal, Virginia,
648. Tubes and Hinges.-William Shaw, Buffaloe, New York,
649. Mortising Timber.-John M'Clintic, Chambersburg, Pennsylvania,
650. Cars, &c. propelling.-Alexander M'Grew, Cincinnati, Ohio,
651. Sawing Stone.-Daniel Bunnel, Xenia, Ohio,

653. Stove.-Philip Benedict, Lancaster, Pennsylvania,

652. Sugar, &c. boiling.-John Steele, jr. New York,

655. Boots, &c. cutting.-Josiah T. Buck, New Canaan, Connecticut, 656. Horse Collars.-Caleb Angerine, New York,

654. Oven.-Jacob Baldwin, New York,

657. Moulds for Sugar, &c.-Charles Duncan, Williamsburg, New York,
658. Power Motion Machine.-David Russell, Tuscambia, Alabama,
659. Portable Saw Mill.-David Russel, Tuscambia, Alabama,
660. Rail-road Carriage.-William T. James, New York,

661. Fire-place.-John Chapin Howard, Howard's Valley, Connecticut, 662. Cotton Whipper.-Luccan Osgood, Pomfret, Connecticut,

663. Cotton Seed, hulling.-A. Miller and T. Lawes, Washington County, Miss.

664. Plough Coulters, &c.-Samuel A. Sperry, Washtenaw, Michigan Territory,
665. Lock for Drawers.-Edward Brown, Lynchburg, Virginia,
666. Cloths, drying.-Stephen R. Parkhurst, Worcester, Massachusetts,

667. Planing Machine.-Ira McLaughlin and Hiram Hill, Sunderland, Vermont,
668. Staves, dressing.-Joseph Sweet, Lycoming County, Pennsylvania,
669. Corn, crushing, &c.-Anderson P. H. Jerdon, Madisonville, Tennessee,
670. Cement.-Charles Clinton, Minnisink, New York,

671. Horse Power.-A. Trahern, H. Heberling, Wm. E. Lukins and J. Heberling Harrison County, Ohio,

672. Ploughs.-John W. Jardan, Lexington, Virginia,

673. Gridiron, rotary.-Kellog Strong, Meriden, Connecticut,

674. Cutting Teeth, &c.-Andrew T. Mirven, Lycoming County, Pennsylvania, 675. Pumps.-Joseph Redelsperger, Mansfield, New Jersey,

676. Rotary Pump.-C. Peters and Benjn. Dean, Poughkeepsie, New York, 677. Truss, spring.-Henry Reid, Augusta, Georgia,

678. Comb, metallic.-Nathaniel Bushnell, Middletown, Connecticut, 679. Taylor's Measure.-Frederic A. Fairchild, Columbus, Georgia, 680. Steel Yard.-C. F. Dahl, Pittsburg, Pennsylvania,

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681. Stove, or Fire Place.-Daniel Sutherland, Lisbon, Maine,

TO READERS.

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Owing to the press of original matter for the present number of the Journal, it has been necessary to omit many selections prepared for the number. This has been done in those departments which are most copiously represented in the original matter.

The next number will contain a further portion of the report of the Committee on the explosions of Steam-boilers.

The Mechanics' Register will also be supplied with selections at present unavoidably excluded.

COM PUB.

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The Celestial Phenomena for 1836, include all the occultations of fixed stars by the Moon to the 6th magnitude inclusive visible at Philadelphia.

The angles under N. and V. respectively denote the angular distance of the point of immersion or emersion, from the apparent north or vertical point of the Moon's disc, as seen in a telescope which inverts. These angles are reckoned to the right or ap parent west round the circle.

S. C. W.

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