LONGMANS, GREEN, 6- CO.' S PUBLICATIONS. 

 LESSONS IN ELEMENTARY MECHANICS. 



By W. H. Grieve, P. S.A., late Engineer R.N., Science Demonstrator for 

 the London School Board, etc. 



Part I. Matter in three states: solids, liquids, gases. Mechanical proper- 

 ties peculiar to each state. Matter is porous, compressible, elastic. 

 Measurement as practised by mechanics. Measures of length, time, 

 velocity, and space. With 165 Illustrations and a large number of Ex- 

 amples. i2mo. 50 cents. 



Part 2. Matter in motion. The weight of a body, its inertia and momen- 

 tum. Measures of force, work, and energy. Energy may be trans- 

 formed, but cannot be destroyed. Heat as a form of energy. With 122 

 Illustrations. i2mo. 50 cents. 



Part 3. The simple mechanical powers, viz.: (i) the lever ; (2) the wheel 

 and axle ; (3) pulleys ; (4) the inclined plane ; (5) the wedge ; (6) the 

 screw. Liquid pressure ; the hydrostatic press ; liquids under the action 

 of gravity. The parallelogram of forces ; the parallelogi'am of veloci- 

 ties ; examples commonly met with illustrating the mechanical powers. 

 With 103 Illustrations. i2mo. 50 cents. 



ELEMENTARY SCIENCE LESSONS. Being a Systematic Course 



of Practical Object Lessons. Illustrated by Simple Experiments. 

 By W. Hewitt, B.Sc. Parts I., II., III., and IV. Each, 50 cents. 



AN INTRODUCTION TO MACHINE-DRAWING AND DE- * 

 SIGN. 



By David All.vn Low (Whitworth Scholar), Principal of the Technical 

 School, People's Palace, London. With 65 Illustrations and Dia- 

 grams. Crown 8vo. 60 cents. 



In producing this work the author has aimed at placing before young stu- 

 dents and others, who wish to acquire the skill and knowledge necessary for 

 making the simpler working drawings, such as are produced in engineers' draw- 

 ing offices, a number of good exercises in drawing, sufficient for one session's 

 work, and at the same time a corresponding amount of information on the de- 

 sign of machine details generally. 



EXERCISES IN WOOD WORKING for Handicraft Classes in Ele- 

 mentary and Technical Schools. 



By William Cawthorne Unwin, F.R.S., Member Inst. C.E. 28 Plates. 

 Fcp. folio. Incase. $1.50. 



*^* For other books oti clemetitary science, see Longmans, Green, &= Co.'s Cata- 

 logue of Educational Works. 



LONGMANS, GREEN, & CO., 15 East Sixteenth Street, New York. 



