Wax light, cost of, as compared with gas,

500

Weaving, figure, 336, 309

Weights and measures, standard, 24
Weighing-machine, Newton's, 319
Weight hoisting machinery, Holmes's, 379
Well-sinking, 309, 375

Wheels, plan to drive, by elastic friction,
385

White, Capt. M., on the tides, 360
White, James, Esq., C.E.; plan to drive
wheels by elastic friction, 385
Whitelaw and Stirrat's hydraulic engines,

418

Whittlesay's rotary`steam-engine, 157
Whitworth's guide screw-stock, 464
Whitworth's street-sweeping machine, 608
Williams, C. W. Esq. on combustion,
furnaces and boilers, smoke nuisance,
&c., 11, 19, 31, 57, 131, 165, 227, 275,
394, 448, 595

Wilson, J. T., Esq., on blasting rocks by
galvanism, 70

Windmills, Zimmermann's, 379

Windlasses, Grill's improvements in, 337
Wire-gauges, standard, 520

Wire-rope, Smith's, 189

Newall's, 192, 199

immense, 528

NOTICES TO CORRESPONDENTS.

[Selected from the covers of the Weekly Numbers, as being more or less of permanent interest.]
MR. WEBSTER'S BOOK ON PATENTS is the latest, and also the best." A Patent Pro-
prietor" may also consult with advantage the smaller work by the same able and judicious
writer on "The Subject Matter of Letters Patent for Inventions."

MODELS OR SPECIMENS OF INVENTIONS may be sent to the Polytechnic Institution,
where they will be exhibited to the best possible advantage, and where inventors are sure,
besides, to experience the most courteous treatment at the hands of the manager and
secretary.

PARTICIPATION IN INVENTIONS (A Master Manufacturer).-If the workman was merely employed to work out his master's ideas, and invented nothing himself, he has no claim in law or equity to any share of the proposed patent.

DISCLAIMERS are not all advertised. please in this respect.

The law officers of the Crown may do as they

TREVETHICK is still without any monument to his memory—the more the shame. lies buried in Dartford churchyard.

He

DISCOVERY OF THE LONGITUDE.-P. V. has won. There is no longer any reward offered by Government in relation to the discovery of the longitude. The truth is, that the skill and ingenuity of our chronometer-makers have left nothing to be discovered.

THE GOVERNMENT SCHOOL OF DESIGN teaches drawing only, and as long as it does so, will never turn out a good practical designer of soft goods patterns. "D. S." should send his son to some of the Manchester or Glasgow print-works.

DESIGNS REGISTRABLE UNDER THE NEW ACT.-(A Designer.) The New Act strictly confines the privilege of registration to ornamental designs.

FICTITIOUS USE OF THE TERM "PATENT." There is no statutory penalty; the only objection is, that the thing is dishonest, and would probably be held to be a fraud by the common law of the land.

PERPETUAL MOTION. The following brief extract from the illustrious Smeaton, may perhaps suffice for an answer to " Experimentalist." "We want (for perpetual motion) bodies having the following properties: that when they are made to ascend against gravitation, their absolute weight shall be less; and when they descend by gravitation through an equal space, their absolute weight shall be greater, which, according to all we know of nature, is a repugnant or contradictory idea.”

Just published, price 6d.

THE ACT (5 & 6 Vic. CAP. C.) TO CONSOLIDATE AND AMEND THE LAWS RELATING TO

COPYRIGHT OF DESIGNS

FOR ORNAMENTING ARTICLES OF MANUFACTURE;

WITH

EXPLANATORY NOTES, PRACTICAL DIRECTIONS, TABLE OF FEES, AND FORMS.

BY MESSRS. J. C. ROBERTSON AND CO.

Agents for Registration of Designs and Solicitation of Patents.