Tracing efforts to control unwanted sound--the noise of industry, city traffic, gramophones and radios, and aircraft--from the late nineteenth to the late twentieth century.
"In Big Machines find out about the largest machines ever made, from giant excavators, bulldozers and tunnelling machines, to monster ships, trucks and planes. Discover the gigantic jobs big machines do and how they work.
Big Machines, Small Machines
Uses simple experiments to demonstrate the qualities and functions of such basic machines as the wheel, lever, and fulcrum.
Introduces the concept of machinery. 5-8 yrs.
Steck-Vaughn, Steck-Vaughn Company.
Various machine pop-ups demonstrate their functions.
机械与运动
One of series of information books for beginner and developing readers in which three children out on a cycle ride start to look around them at all the uses to which wheels are put - on cars and tractors, inside the caterpillar tracks of ...
Labeled illustrations introduce machinery relating to transportation, agriculture, and construction, briefly explaining the work of such machines.
Simple word and picture introduction to coal mines, forests, building, roadworks etc.