Improved Foot Lathes. Many a reader of this paper has one of them.

Selling in all parts of the country, Canada, Europe, etc. Catalogue free. N. H. Baldwin, Laconia, N. H.

Peteler Portable R. R. Co. contractors, graders. See adv'ment.

E. P. Peac.o.c.k, Manufacturer of Cutting Dies, Press Work. Patent Articles in Metals, etc. 55 Franklin st., Chicago.

Peck's Patent Drop Press. Milo Peck & Co., New Haven, Ct.

Millstone Dressing Diamond Machine--Simple, effective, durable. For description of the above see Scientific American, Nov. 27th, 1869.

Also, Glazier's Diamonds. John d.i.c.kinson, 64 Na.s.sau st., N. Y.

Steel name stamps, figures, etc. E. H. Payn, M'f'r, Burlington, Vt.

Cold Rolled-Shafting, piston rods, pump rods, Collins pat. double compression couplings, manufactured by Jones & Laughlins, Pittsburgh, Pa.

Keuffel & Esser 116 Fulton st., N. Y., the best place to get 1st-cla.s.s Drawing Materials, Swiss instruments, and Rubber Triangles and Curves.

For Solid Wrought-iron Beams, etc., see advertis.e.m.e.nt. Address Union Iron Mills, Pittsburgh, Pa., for lithograph, etc.

For the best Self-regulating Windmill in the world, to pump water for residences, farms, city buildings, drainage, and irrigation, address Con. Windmill Co., 5 College Place, New York.

The Merriman Bolt Cutter--the best made. Send for circulars. H. B.

Brown & Co., Fair Haven, Conn.

Taft's Portable Hot Air, Vapor and Shower Bathing Apparatus. Address Portable Bath Co., Sag Harbor, N. Y. (Send for Circular.)

Glynn's Anti-Incrustator for Steam Boilers--The only reliable preventive. No foaming, and does not attack metals of boilers. Price 25 cents per lb. C. D. Fredricks, 587 Broadway, New York.

For Fruit-Can Tools, Presses, Dies for all Metals, apply to Bliss & Williams, successor to May & Bliss, 118, 120, and 122 Plymouth st., Brooklyn, N. Y. Send for catalogue.

2d-hand Worthington, Woodward and Novelty Pumps, Engines 25 to 100 H. P., 60 Horse Loc. Boiler. W. D. Andrews & Bro., 414 Water st., N. Y.

Agents wanted, to sell the Star Bevel. It supersedes the old style.

Send for Circular. Hallett & White, West Meriden, Conn.

English and American Cotton Machinery and Yarns, Beam Warps and Machine Tools. Thos. Pray, Jr., 57 Weybosset st., Providence, R. I.

For small, soft, Gray Iron Castings, j.a.panned, Tinned, or Bronzed, address Enterprise Manufacturing Company, Philadelphia.

Conklin's Detachable Rubber Lip, for bowls, etc., works like a charm.

For Rights, address O. P. Conklin, Worcester, Ma.s.s., or A. Daul, Philadelphia, Pa.

To Ascertain where there will be a demand for new machinery or manufacturers' supplies read Boston Commercial Bulletin's Manufacturing News of the United States. Terms $4.00 a year.

FACTS FOR THE LADIES.

In 1870, Mrs. W. made, with her Wheeler & Wilson machine, 2,255 vests, besides doing her family sewing for six persons.

THE PITTSBURGH, PA., "LEADER" SAYS:

"The firm of Geo. P. Rowell & Co. is the largest and best Advertising Agency in the United States, and we can cheerfully recommend it to the attention of those who desire to advertise their business scientifically and systematically in such a way; that is, to secure the largest amount of publicity for the least expenditure of money."

AFTER AN EXHAUSTIVE TRIAL, at American Inst.i.tute Fair for 1870, Pratt's Astral Oil was p.r.o.nounced the safest and best.

DYSPEPSIA: Its Varieties, Causes, Symptoms, and Cure. By E. P. MILLER, M. D. Paper, 50cts.; Muslin, $1. Address MILLER, HAYNES & CO., 41 West Twenty-sixth st., New York city.

VITAL FORCE: How Wasted and How Preserved; or, Abuses of the s.e.xual Function, their Causes Effects and Means of Cure. By E. P. MILLER M. D.

Paper, 50cts. Address MILLER, HAYNES & CO., 41 West Twenty-sixth st., New York city.

ANSWERS TO CORRESPONDENTS.

_CORRESPONDENTS who expect to receive answers to their letters must, in all cases, sign their names. We have a right to know those who seek information from us; besides, as sometimes happens, we may prefer to address correspondents by mail._

_SPECIAL NOTE.--This column is designed for the general interest and instruction of our readers, not for gratuitous replies to questions of a purely business or personal nature. We will publish such inquiries, however, when paid for as advertis.e.m.e.nts at 1.00 a line, under the head of "Business and Personal."_

_All reference to back numbers must be by volume and page._

MIXING METALS.--All the hard gray American charcoal iron, of which car wheels and all such work are made, requires more heat and a longer time to melt than soft iron, especially Scotch pig, which is the most fluid and the easiest to melt of any iron. Consequently, unless the melter exercises good judgment in charging, the Scotch pig will melt and run off before the car-wheel iron is melted. If G. H. P.

be particular in the quality and strength of his iron, he will make better results by using soft American charcoal pig, with old car-wheel iron. It will make stronger castings, mix better, and melt more uniformly; but he should always recollect in charging his furnace that soft iron will melt before hard in the same position, in the cupola. I also think he had better use a larger proportion of soft pig, as every time cast iron is melted it becomes harder, so much so that iron which can be filed and turned with ease, when re-cast will often be found too hard to work.--J. T., of N. Y.