BY E. J. WALL, F.R.P.S. Author of _The Dictionary of Photography_, etc., etc.

NEW YORK: SPON & CHAMBERLAIN, 12 CORTLANDT STREET. 1892

Induction Coils, How to Make, Use, and Repair Them. — Part 91

Printed on one side, in blue ink, all the lines being of equal thickness, with useful tables. Size 8 × 10 inches. Price, 25c. each. Per dozen pads, $2.50.

Induction Coils, How to Make, Use, and Repair Them. — Part 91

Made from this paper but printed on both sides. Size of book 5 × 8 inches, stiff board covers. Price, 25c. each; per dozen books, $2.50.

Induction Coils, How to Make, Use, and Repair Them. — Part 91

A large sheet with heavy inch lines and half inch lines, printed in blue ink. Size of sheet, 17 × 22 inches. Per quire (24 sheets), 75c.

Size 17 x 22 inches, printed in blue ink, with heavy inch lines and half inch lines. Per quire (24 sheets), 75c.

Size 8 × 10. Scale 10 to 1 in. Price 25c. each. Per dozen, $2.50.

Made from this paper. Scale 10 to 1 inch. Size of book 5 × 8 inches, with stiff board covers. Price, 25c. each; per dozen, $2.50.

Any quantity mailed to any part of the world on receipt of price.

Or Books and Pads Assorted, per dozen, $2.50

This paper is _not ruled_. Try it and you will find it GOOD, ACCURATE AND CHEAP.

SPON & CHAMBERLAIN, 12 Cortlandt St., NEW YORK.

Notes on Alloys and a Chapter on Soft Soldering

The flame, lamp, charcoal, mats, blow-pipes, wash-bottle, binding wire, chemicals, borax, spelter, silver solder, gold solder, oxidation of metals, fluxes, anti-oxidisers, oxidation of cases, the cone, oxidising flame, reducing flame, heat transmission, conduction, capacity of metals, radiation, application, the work table, the joint, applying solder, applying heat, the use of the blow-pipe, joints, making a ferrule, to repair a spoon, to repair a watch case, hard soldering with a forge or hearth, hard soldering with tongs, preserving thin edges, silversmith's pickle, restoring color to gold, chromic acid, to mend steel springs, sweating metals together, retaining work in position, making joints, applying heat, preventing the loss of heat, effect of sulphur lead and zinc, to preserve precious stones, annealing and hardening, burnt iron, to hard solder after soft solder. Tables of—specific gravity, tenacity, fusibility, alloys.

For Soldering Receipts, Cements and Lutes, Pastes, Glues and such like, _see_ WORKSHOP RECEIPTS.

_A Practical Handbook for Students and Young Electricians_