Object Lessons in Elementary Science: Following the Scheme Issued by the London School Board, Volume 3Macmillan, 1894 - Science |
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Object Lessons in Elementary Science: Following the Scheme Issued ..., Volume 2 Vincent T. Murche No preview available - 2018 |
Common terms and phrases
animals auricles become black-board sketch blood body boiling bone bottle bread Bunsen burner burning Call attention carbonic acid chlorine class tell class to tell cloth cocoa cold colour combustion contains cord cotton dissolved dried earlier lessons fibres fire flame flask flesh-forming force fruit fulcrum gases gluten grains hair heat heat-giving Hence hydrochloric acid hydrogen important inch incisors inclined plane iron juice kind known lacteals Lead the children Lead the class leather leaves length lever liquid lungs maize manufacture material mechanical advantage mercury metal mineral matter ossein oxide oxygen particles pass phosphorus piece piston plant prepared properties pulley quantity round salt seeds sheep side skin solid specimens starch steam substance sugar sulphur surface teeth temperature threads tree tube turpentine upwards vapour vegetable ventricle vessel weight wheel wool
Popular passages
Page 51 - ... water But as, from the conditions of the experiment, they have each been receiving the same amount of heat, it is clear that the quantity of heat which is sufficient to raise the temperature of mercury through a certain number of degrees will raise the...
Page 236 - The upper chambers are called the RIGHT AND LEFT AURICLES; the lower, the RIGHT AND LEFT VENTRICLES. THE HEART IS REALLY A DOUBLE ORGAN, CONSISTING OF TWO COMPLETE HEARTS. There is a passage between the upper and lower chamber on each side so that whatever is in the auricle can pass through into the ventricle below; but there is no direct communication between the right and left sides of the heart. Make a diagram on the blackboard showing these four chambers of the heart.
Page 167 - Lead them to explain that it is in reality nothing more than a lever of the first order, having the power at one end, the weight at the other, and the fulcrum between the two. What can you tell me about the arms of this leverwheel? They are equal. What then is the mechanical advantage of such a wheel...
Page ix - Matter in three states; solids, liquids, and gases. Mechanical properties peculiar to each state. Matter is porous, compressible, elastic. Measurement as practised by mechanics. Measures of length, time, velocity, and space.
Page 20 - The metals are the best conductors of all, but they differ very much one from the other. They stand thus in the order of their conducting power : — silver, copper, gold, brass, tin, iron, lead, platinum, and bismuth, — silver being the best. Among the bad conductors are marble, stone, brick, glass, earthenware, sealing-wax, leather, wood, linen, cotton, and straw. " The non-conductors include bone, horn, feathers, down, fur, wool, flannel, silk, hair, cork, india-rubber, and air.
Page 156 - Ib. weights acting at these distances from the fulcrum. Show that this is only repeating what we said about the first order of levers, except that in this case we have the power-arm and the weight-arm on the same side of the fulcrum. In the second order of levers the power always acts at one end, the fulcrum being at the other, and the weight between them. The longer the power-arm is, as compared with the weight-arm, the greater will be the weight which a given power can raise. The power multiplied...
Page 157 - ... it increases, and he is able to raise the bigger boy. When it becomes the turn of the big boy to act as power, the power is considerably greater than the weight to be raised, because it is acting at the short arm of the lever. Now consider for a moment. Which boy has the best ride ? The little boy. His end of the see-saw rises higher, and moves more quickly than the other end. Now I think you will be able to understand what I am going to say further.
Page 94 - Demerara, grows to the height of thirty feet, but under cultivation the pruning-knife keeps it down to the size and shape of an ordinary cherry-tree. It is an evergreen, the leaves being very similar to those of the cherry, except that they are smooth and glossy, as is the general case with evergreens. The tree does not begin to bear till its sixth year, but after that it is very prolific. The flowers, which are small, grow in thick clusters on the trunk and main branches. The fruit is a kind...
Page 275 - ... town, the drive is under the shadow of lofty hills, richly cultivated and occasionally as richly planted. Between the road and the water, extends a remarkably fertile valley, thick with trees and underwood ; and beyond it stretches the long and narrow Lough with its multitude of islands. These islands are said to equal in number the days of the year;* they are very numerous ; and of all sizes, from the small " clot" to the plain of many acres. All of them are green, and most of them are very...
Page 243 - These two substances—carbonic acid and water—are being constantly formed by the burning up of the carbon and hydrogen in the body. There are other products of the burning—one in particular, ammonia; but carbonic acid and water are the chief. The blood, as it courses through the body, absorbs these products of the burning, and they change its character from a life-giving to a poisonous stream. It becomes dark purple in colour, and is carried in this state by the veins back to the heart and so...