Crossword-Solution: ROTATIVE 8 letters, 1 clue 🏆 scrabble score: 11

XLVIII Come, rest your Head if Earth rotative seems And close your Lids from these o'er wakeful Gleams - Although your Palate cringe you shall not shrink Within the Kitchen of the House of Dreams.

There are however methods by which either a rotative or alternating motion may be produced by very moderate degrees of heat.

The expansive force of steam was known in some degree to the antients, Hero of Alexandria describes an application of it to produce a rotative motion by the re-action of steam issuing from a sphere mounted upon an axis, through two small tubes bent into tangents, and issuing from the opposite sides of the equatorial diameter of the sphere, the sphere was supplied with steam by a pipe communicating with a pan of boiling water, and entering the sphere at one of its poles.

CONTENTS--Early History of Pumping Engines--Steam Pumping Engines--Pumps and Pump Valves--General Principles of Non-Rotative Pumping Engines--The Cornish Engine, Simple and Compound--Types of Mining Engines--Pit Work--Shaft Sinking--Hydraulic Transmission of Power in Mines--Valve Gears of Pumping Engines--Water Pressure Pumping Engines--Water Works Engines--Pumping Engine Economy and Trials of Pumping Machinery--Centrifugal and other Low-Lift Pumps--Hydraulic Rams.

The cause of this is ascribed by Professor Dove to the transfer of the equatorial portions to a higher latitude, by which the excess of its rotative velocity is made apparent, by outstripping the slower moving surface in its progress eastward.