Elements of Trigonometry: Plane and Spherical

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Sheldon & Company, 1877 - 201 sider
 

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Side 54 - ... subject of Geography of any yet published. It is simple and comprehensive, and embraces just what the child should be taught, and nothing more. It also embraces the general principles of Physical Geography so far as they can be taught to advantage in Common Schools. For those desiring to pursue the study of Physical Geography, we have prepared Cotton's Physical Geography.
Side 64 - What was the perpendicular height of a balloon, when its angles of elevation were 35° and 64°, as taken by two observers on the same level, at the same time, both on the same side of it, and in the same vertical plane ; the distance between the two observers being 880 yards ? Ans., 935.757 yards.
Side 55 - The universal favor with which these books have been received by educators in all parts of the country, leads the publishers to think that they have supplied a felt want in our educational appliances. There is one feature which characterizes this series, so unique, and yet so eminently practical, that we feel desirous of calling special attention to it. It is The facility with which the books can be used for classes of all grades, and in schools of the widest diversity of purpose.
Side 54 - It meets the exact wants of our Grammar Schools. The Review is unsurpassed in its tendency to make thorough and reliable scholars. I have learned more Geography that is practical and available during the short time we have used this work, than in all my life before, including ten years teaching by Mitchell's plan.—AB HETWOOD, Prin.
Side 96 - In a spherical triangle the cosine of any side is equal to the product of the cosines of the other two sides plus the product of the sines of these two sides and the cosine of their included angle.
Side 55 - ... is The facility with which the books can be used for classes of all grades, and in schools of the widest diversity of purpose, Each volume in the series is so constructed that it may be used with equal ease by the youngest and least disciplined...

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