These are feather-weights; they want ballast. 夏洛蒂·勃朗特.雪莉.
Its pioneer form may be traced back to the Middle Ages, when heavy weights were lifted by aid of an apparatus worked by hand power. 佚名.神奇的知识之书.
If a soft iron nail (Fig. 212) or its equivalent is slipped within the coil, the lifting and attractive power of the coil is increased, and comparatively heavy weights can be lifted. 伯莎M.克拉克.科学通论.
The weights were raised, and Mr. Wright took his place. 鲁伯特·萨金特·荷兰.历史性发明.
Lifting heavy weights through great distances is not the only way in which work is done. 伯莎M.克拉克.科学通论.
Dairy weights of ensilage fed to the stock were not taken. 威廉K.戴维.智者、化学家和伟大医生的秘密.
This prince has several machines fixed on wheels, for the carriage of trees and other great weights. 乔纳森·斯威夫特.格列佛游记.
And to this purpose, several packthreads were let down, with small weights at the bottom. 乔纳森·斯威夫特.格列佛游记.
A relatively simple complex machine called the crane (Fig. 116) maybe seen almost any day on the street, or wherever heavy weights are being lifted. 伯莎M.克拉克.科学通论.
The pieces of cork are flattened out by heat or by weights, and are slightly charred on the surface to close the pores. 佚名.神奇的知识之书.
Then as to the rail: first the wooden, then the iron and now the steel, and all of many shapes and weights. 威廉·亨利·杜利特.世纪发明.
A horseshoe electromagnet is powerful enough to support heavy weights. 伯莎M.克拉克.科学通论.
Leaden weights are attached to the diver, and his shoes are weighted, that he may be able to descend a ladder, walk about below, etc. 佚名.神奇的知识之书.
The Arabs also made fair approximations to the correct specific weights of gold, copper, mercur y, and lead. 李贝.西洋科学史.
This is a very common method for raising heavy weights by small force. 伯莎M.克拉克.科学通论.
Meantime Dalton's mind had been turning to the consideration of the relative sizes and weights of the various elements entering int o combination with one another. 李贝.西洋科学史.
Van Elvean, also of England, in 1858 invented counterbalance weights for such lifts. 威廉·亨利·杜利特.世纪发明.
Moreover, for p recision in the use of medicaments weights of very small denominations were employed. 李贝.西洋科学史.
He went away as if weights were tied to every limb that bore him from her. 伊丽莎白·盖斯凯尔.南方与北方.
A simple derrick for raising weights. 伯莎M.克拉克.科学通论.
Is it a fact that at the weights Bayard could give the other a hundred yards in five furlongs, and that the stable have put their money on him? 阿瑟·柯南·道尔.福尔摩斯回忆录.
The two were pressed together by means of weights. 鲁伯特·萨金特·荷兰.历史性发明.
I sat up straight and as I did so something inside my head moved like the weights on a doll's eyes and it hit me inside in back of my eyeballs. 欧内斯特·海明威.永别了,武器.
Aristotle had held that two moving bodies of the same sort and in the same medium have velocities in pr oportion to their weights. 李贝.西洋科学史.
When Dalton had investigated the relative weights with which elements combine, he had found no simple arithmetical relationship betw een atomic weight and atomic weight. 李贝.西洋科学史.
Yet in spite of having those weights on his conscience, Eugene was somewhat enlivened by the late slight change in the circumstances of affairs. 查尔斯·狄更斯.我们共同的朋友.
Separate the residuum in as many definite parts as possible, bottle and label, and keep accurate records as to process, weights, etc. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.