Technology & Engineering PDF books download free

Illustrations of the Croton Aqueduct

by F. B. Tower

The views which I have given of the important points on the line of the Croton Aqueduct, are from sketches taken for my own satisfaction; but the interest so generally taken in the work, has suggested to me the propriety of presenting them to the public in this form. Having been engaged in the Engineer Department during the whole of the constructio..

The World of Flying Saucers

by Donald H. Menzel

Both as scientists and as devotees of science fiction, we have long been interested in space travel. When reports of unidentified flying objects began to increase in the years between 1947 and 1952, one of us (D.H.M.) collected and studied the limited information available about the sightings. He soon concluded (with a slight feeling of disappointm..

Wireless Telegraphy and Telephony Simply Explained

by Alfred Powell Morgan

Probably no marvel of modern science so grips the imagination as the mystery of those quivering impulses which go forth invisibly to link a ship sailing over the seas with the shores of the distant land.The author has endeavored to furnish a comprehensive explanation, in simple language, of the theory and practice of this wonderful art, and to expl..

The Almond in California

by R. H. Taylor

The almond (Prunus communis) is supposed to be native to the countries around the Mediterranean and at present the bulk of the world’s supply is produced in that region. It resembles the peach somewhat in manner of growth and character of blossoms and leaves, but the wood is much harder and the tree is longer-lived under equally favorable condition..

Survival at Altitude for Heavy and Very Heavy Bomber Crews

by Anonymous

These notes were originally intended as a source of general reference concerning OXYGEN EQUIPMENT AND ITS USE by members of crews of the B-17 and B-24 heavy bomber. As a member of a heavy bomber team, in combat you will be living and fighting in a world where man has no business--from three to six miles above the environment for which nature design..

The Railway Conquest of the World

by Frederick A. Talbot

There is the unfathomable fascination of romance connected with the construction of great railways, though little is known of the beginning and the growth of the great trunk roads of the world; of the heavy tax which their construction imposed upon the ingenuity, skill and resource of their builders. Speeding along swiftly in a luxurious Pullman ca..

The Flowers and Gardens of Madeira

by Florence Du Cane

The very name of Madeira (or island of timber, as the word signifies) brings to the minds of most people a suggestion of luxuriant vegetation flourishing in a damp, enervating climate. Such, indeed, was my own mental picture of Madeira before my first visit to the island. I expected to find every garden with the aspect of a fernery, moisture drippi..

Keeping Down the Cost of Your Woodwork