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Desks and Office Furniture.

A. L. Hale & Bro ......................................... Chicago, Ill.................... See Page 206 Joseph Churchyard...................................... Buffalo, N. Y........ 4 & © to e o e o to a e “ 160 Dies. Champlin & Rogers....................................... Chicago, Ill................ . See Page 192 J. J. Walworth............................................. £ 4 “.................. {{ T24 Mathiesen & Schrader................................... New York..................... & 4 82 Door Knobs. Romer & Co............... to g o os e o e o to to e o is e o e s to go e g o & o e o e o os o e o e o e Newark, N. J................. See Page 201 Door Machinery. C. B. Rogers & Co......................................... New York....................... See Page 270 J. A. Fay & Co............................................. Cincinnati, Ohio.............. {{ 206 Richards, London & Kelley............................ Philadelphia, Pa............ $6 66 Drawing Room Car Hassocks, &c. George Drake Smith..................................... Philadelphia, Pa............. See age 246 New York Ottoman & Hassock Co.................. New York..................... § { 236 Drill Crinding Machines. Wm. Sellers & Co.................................... ... Philadelphia, Pa......... See Page 64 STRENGTH AND EQUIWALENTS OF FLAT ROPES. Manchester (England) List. Bre king Working HEMP. IRON WIRE. STEEL WIRE. Strain. Load. Circumference. Circumfereuce. Circumference. Tons. Cwt. Inches. Inches. Inches. 16 ...... 32 ...... 3 by 1 ...... 176 by #3 “... 20 ...... 40 * @ & © to e 4 “ 1% ...... 2 66 % to go e e s to 22 ...... 48 ...... 5 “ 1% ...... % . .3 ... 24 ...... 56 ...... 5% “ 1% ...... 3% “ . ...... 1% by 34 26 ...... 64 ...... 5% “ 1% ...... 3 “ 9% ...... 2 “ 5g 27 ...... 72 ...... 5% “ }% 4 ** 3% “ 3% ...... 23 ..... o 80 ...... 6 “ 1% ...... 3% “ à & e o go to go 2% “ 3% 32 ...... 88 ...... 6% “ 1% ...... 3% “ # to go to e o o 36 ...... 96 ...... 7 “ 1% ...... 4 “ % & e o & © to 2% “ og 40 ...... 18 ...... so 3,3 ... * “ . . 3 “ og 46 ...... 120 ...... § “ 2% ... 4% “ 3% ...... 3% “ 3% 58 ...... 145 ...... 10 “ 2% ..... 5 “ 7% ...... 3% “ 34 70 ...... 175 ...... 11% “ 234 ...... 5% “ 1 ...... 4% “ 33 85 ...... 210 * & e o os 3 “ 3 ...... Ö “ 1 ...... 4% “ 7% WEIGHT OF FLAT ROPES. Manchester (England) List. HEMP. IRON WIRE. STEEL WIRE. Size Weight Size Wight Sze Weight in Inches. per Fathom. in Inches. Po" Fathom. in Inches. per Fathom. 3 h Lbs. % l Lbs. 7 Lbs. by 1 ...... 16 1% by 3% ..... * 8 1% by 3% ...... 8 : . #: * e < * * * 20 * 66 % to e o a o so 10 % “ ‘’s ...... 10 1% ..... * 22 2% “ 3% ...... 12 2% “ 3% ...... 12 5% “ 1% ...... 24 % “ § go o so o 'o & 14 22g “ : ...... 12 5% “ 1% ...... 26 3 “ 9% ...... I6 3 “ 93 ..... . . 16 5% “ }% to e e o & o 27 #4 “ 3% ...... 18 3% “ 9% ..... e I8 6, , ; 1% ...... 28 || 3% 34 ...... 35 | 3% “ 3: ... 24 5); “ iá. 33 ||3% “ # to e o e o 'op 3; is: “ % ... .. 28 7 “ 1% ...... 3 4 “ % to e o so o ge 24 4% “ 3% ...... 34 7% “ 2% ...... 40 #4 “ 3% ...... 28 § “ 25% ... is is: “ . . 30 10 “ 2% ...... 63 5 “ 3% ...... 39 ii); “ 2% ... is #34 “ ”. 48 13 “ 3 ...... 98 6 “ 1 ...... 59

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C U R T A IN S I L KS, COTE LIN E S, &c.

99 CHAMBERS ST, comes of CHURCE, NEW YORK.

NIAGARA STEAM PUMP WORKS

*N This Pump has taken the , , first premium, at every Fair in the United States where there has been a practical test.

(HAS, B. HARDISK, 23 Adams Street, BROOKLYN, N. Y. = sor E MANUFACTURER OF # Hardick's Patent Dowble *...*H 46tong Steam Pumps - === and Fire Engines. Patented in England, Belgium and France. To Send for Circular.

HOLMES & L ISS BERG ER,

IMPORTERS AND DEALERS IN

C, O. P. P. E. F.

MANUFACTURERS OF I ocomotive Fire Box Sheets and Flues, Braziers” and Sheet Copper, Kettle Bottoms, Bolts, Rivets, St. ips, Circles and Tubes, Pig and Ingot Copper, Spelter, Solder, Tin and Lead, Pig iron, Old Rails, &c., &c., &c.

255 & 257 PEARL STREET, - NEW YORK.

AGENTs For THE NEW HAVEN coPPER Co.

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drills. Barwick Wrench Co...................................... Boston, Mass................... See Page 60 L. W. Pond...................................................Worcester, Mass ............ { % I58 Rand & Waring Drill & Compressor Co...........New York............ ......See Front Page.

See also Drilling Machines, Tools, &c.

WIND MILLS.

Deduction from Velocities varying from 4 to 9 Feet per Second. (Haswell.)

1. The velocity of wind-mill sails, so as to produce a maximum effect, is nearly as the velocity of the wind, their shape and position being the same. . 2. The load at the maximum is nearly, but somewhat less than, as the square of the velocity of the wind, the shape and position of the sails being the same. 3. The effects of the same sails, at a maximum, are nearly, but somewhat less than, as the cubes of the velocity of the wind. 4. The load of the same sails, at the maximum is nearly as the squares, and their effect as the cubes of their number of turns in a given time. 5. When sails are loaded so as to produce a maximum effect at a given velocity, and the velocity of the wind increases, the load continuing the same—First, the increase of effect, when the increase of the velocity of the wind is small, will be nearly as the squares of those velocities; Secondly, when the velocity of the wind is double, the effects will be nearly as 10 to 27%; Thirdly, when the velocities compar, d are more than double of that when the given load produces a maximum, the effects increase in nearly the same ratio of the velocity of the wind. 6. In sails where the figure and position are similar, and the velocity of the wind the same, the number of revolutions in a given time will be reciprocally as the radius or length of the sail. 7. The load, at a maximum, which sails of a similar figure and position will Overcome at a given distance from the centre of motion is as the cube of the radius. d 8. The effects of sails of similar figure and position are as the square of the Isà,01IU18. 9. The velocity of the extremities of Dutch sails, as well as of the enlarged sails, in all their usual positions when unladed, or even loaded to a maximum, is considerably greater than that of the wind.

Rule for the Angles of the Sails. (Molesworth.).

A = Angle of the sail with the plane of motion at any part of the sail.
R = Total radius of sail in feet.
D = Distance of any part of the sail from the axis.

18 D2

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R2 If the radius of the wird mill sails be divided into six equal parts, the angles at each of those parts will be as follows, reckoning from the axis:

Distance from axis.......................... I-6 2–6 3–6 4–6 5–6 tip Angle of Sail with axis.................... 67%2 ... 69° ... 71% ... 75° ... 79%. 85°Angle of sail with plane of motion... 22% ... 21 ... 18% ... 15 ... 10.9% 5 Axis of shaft of wind mill with horizon............ = 8° on level ground.

{{ { { { % “ ............ = 15° on high exposed positions. Breadth of whip at axis................. § e o is a to e s e o we e o e o e s to = 1–30th length of whip. Depth { % “ ...................................... = 1–4 oth { % Breadth of whip at tip....................................... == 1–60th & 4 Depth “ § { to e s e o to e o 'o e o e o E to e o 'o o e o & = 1–8t)th { % Width of sail “ ....................................... = 1–3d $g

Divided by the whip in the proportion of 5 to 3, the narrow portion being nearest to the wind. Width of sail at axis................... s & e o 'o e o os e o e o e o 'o o * * * * B of g = 1–5th length of whip. Distance of Sail from axis................................... = 1–7th to go Cross-bars from 16 to 18 inches apart.

Horse-Power and Sail-Area of Wind Mills.
HP 1080600

HP = Horse-power. A =
W = Welocity of wir.d in feet per second. - V3
A = Total area of sails in square feet. A W3
N = Number of sails. HP ==

1080000
Area of each sail = A + N. Velocity of tips of sails = 2.6 W, nearly.

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IIaving been assumed by other makers, we caution the Public

AGAINST IMITATIONS.

An injunction against infringements of our right to the above numbers and others as trade marks, was granted in 1867, and AFFIRMED by the Court of Appeals January, 1872.

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Manufacturers’ Warehouse, 9 1 JOHN STREET, N. Y. JOSEPH GILIOTT & SONS,

HENRY HOE, Sole Agent.

Drilling Machines. Buffalo Machinery Agency............................. Buffalo, N. Y.................. See Page 160 England & Bindley....................................... Pittsburgh, Pa......... to o to go & & { { 162. Isaac H. Shearman....................................... Philadelphia, Pa............. “ 80 Rand & Waring Drill & Compressor Co........... New York................... See Front Page The Pratt & Whitney Co........... © o e o $ $ & e & s e o e < * * * * * * * Hartford, Conn............... See Page 142 Thorne, De Haven & Co.................. a e < * * * * * * is e o $ to e Philadelphia, Pa............. $ 6 38. Wm. B. Bement & Son................................... & 6 “ ............ 6 & 168 Driil Presses. Phelps & Sanger................................... ........Cleveland, Ohio.............. See Page 120 Wm. Sellers & Co.......................................... Philadelphia, Pa............. { % 64 Driving Wheel Lathes. Wm. Sellers & Co.......................................... Philadelphia, Pa............. See Page 64. Drop Presses. Winans & Co......... * & e o e o e o us e e s e e o t e o 'o e o 'o e o os e o e o 'o e s & 8 & e o 'o & New York................ See Page 106. , - . Dryers, Brooklyn White Lead Co...... e e s to w e o e s a e e o e o so o o e o e s is e a New York See Page 268. Jno. W. Masury & Son................................... $6 “ ..................... {{ 214. Wetherill & Bro......... * * * e s s & e e s e < * * * * * * * * e o e o a o os e e o 'o e e s sPhiladelphia, Pa............. {{ 52. Edge Tools. G. B. Walbridge............................................ New York..................... See Page 130 Hermann Boker & Co to e o 'o e o o is e s e o e e e o go to to s # * * * * * & 8 “ ..... ....... See Pages 152, 154 Electrical Engineers. Charles T. Chester . . . . ... .............................. New York...................... See Page 212 M. A. Buell .................................................. Cleveland, Ohio............... {{ 46 Towle & Unger Manufacturing Co.................. New York.......... • e g to $ e o e o e o go {{ 186. Electric Alarms. Charles T. Chester......................................... New York...................... See Page 212 M. A. Buell................................................... Cleveland, Ohio............... $6 46 Towle & Unger Mfg. Co................................. New York..................... { { 186

STRENGTH AND EQUIVALENTS OF ROUND ROPES.
Manchester (England) List.

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4. 48 r & 6 g o o 16() e = e, e o 'o 13 - • e o see 6 - * * * * * * 4%.

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