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Popular Science, new Journal of

Potash, making, Williams' patent,

Power, obtaining, for propelling cars, &c., M'Grew's patent,

Pump for feeding steam engine boilers, by C. Potts, C. E.

Quicksilver engine, Howard's,

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427

273

ib.

Potassa and soda, mode of ascertaining their proportions when mixed,

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West Philadelphia,

Rotary steam engine, Avery's remarks, &c. on

Quadrant, the

Rails, authorship of mode of setting,

Railway, Greenwich, project

pneumatic
undulating

Rail-road from the Ohio to South Carolina,

turning short curves on, Stimpson's patent,

from Hartford to Canadian line,

apparatus for transportation on canals and, Elgar's patent,

Rain, Franklin's hypothesis, notice of, by Prof. A. D. Bache,

at different elevations,

proportion of drainage to fall of

Rotary steam engine, Foster & Avery's patent,

Rutter's heat process,

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Seeds, hulling cotton and other, Ambler's patent,

Shingle beaches, on the motions of, by H. R. Palmer, C. E.

Silk worms, rearing of, Gay's patent,

Sky, colour of, at considerable heights,

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as seen from high mountains

Smelting iron, effect of velocity in blast for

Soda and potash, mode of ascertaining their proportions when mixed,
Spark arrester, A. C. Jones',

Specific gravity, and composition of glass,

Springs, Artesian wells, and spouting fountains, Arago on

Statute of brick and mortar

Canadian twin

Steam engine, experiments for safety

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boilers, explosions of

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boat Wm. Gibbons, explosion of the boiler of

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engine, Avery's rotary

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engine boilers, pump for feeding, by C. Potts, C. E..

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boat boilers, promoting safety in

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on Mr. Perkins' suggestions regarding the explosions of

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carriage, Hancock's

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Steam carriages, Maudsley & Field's,
power, economy of, by F. Burr,

ib.

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Stone planing machine, Hunter's

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SPECIFICATIONS OF AMERICAN PATENTS.

Riding saddles-Van Horn's,

Flasks for moulding iron tea kettles, &c.-David Stewart's,

Cutting sausage meat, and stuffing sausages-Abraham and John Keagy's,
Washing and churning machine-Charles Otis',

Slide valves for steam engines-A. M. Eastwick's,
Improved stove-J. L. Mott's,

combined stove-J. L. Mott's,

Spreading India rubber upon cloth-Wm. Atkinson's,

Preparing and leaching ashes, and making potash-Elijah Williams',
Plummer blocks and slides—Baldwin's,
Destroying weevils in grain-Lee's,

Distilling spirits of turpentine-Jennings',
Improvement in public finance-Golder's,
Turning short curves upon rail-roads-Stimpson's,
Rotary steam engine-Foster and Avery's,
Rearing of silk worms-Gamaliel Gay's,
Doffer for wool carding machines-Parkhurst's,
Propelling cars, boats, &c.-Alexander M'Grew's,
Apparatus for boiling liquids-Steele's,

Apparatus for transportation on canals and rail-roads—Elgar's,
Apparatus for raising vessels-Porter's,

Machine for hulling cotton, and other seeds-Ambler's,

T

Tannate of gelatin, application of, to taking casts from medals,
Tellurium, and its compounds with oxygen,

Thames Tunnel

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JOURNAL

OF THE

FRANKLIN INSTITUTE

OF THE

State of Pennsylvania

AND

MECHANICS' REGISTER.

DEVOTED TO

MECHANICAL AND PHYSICAL SCIENCE,

CIVIL ENGINEERING, THE ARTS AND MANUFACTURES,

AND THE RECORDING OF

AMERICAN AND OTHER PATENTED INVENTIONS.

EDITED

BY THOMAS P. JONES, M. D.

MEMBER OF THE AMERICAN PHILOSOPHICAL SOCIETY, OF THE ACADEMY OF NAT-
URAL SCIENCES, PHILADELPHIA, THE AMERICAN ACADEMY OF ARTS
AND SCIENCES, MASSACHUSETTS, AND CORRESPONDING MEM-

BER OF THE POLYTECHNIC SOCIETY OF PARIS.

NEW SERIES.

VOL. XVIII.

PHILADELPHIA:

PUBLISHED BY THE FRANKLIN INSTITUTE, AT THEIR HALL; KENNEDY & ELLIOTT, WASHINGTON CITY; E. I. COALE & CO.

BALTIMORE; G. & C. CARVILL & CO., NEW YORK; AND

JOSEPH H. FRANCIS, BOSTON.

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