Description And Instructions for Use of Weldon Range Finder, Revised March 1, 1906, Revised February 1, 1909
Description And Instructions for Use of Weldon Range Finder, Revised March 1, 1906, Revised February 1, 1909
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It is an accurate and sensitive instrument, and must be handled with skill and care. Avoid jerking, bending, or twisting it. If sand, grit, or dirt gets on it, clean it before winding. Also in wet weather, or in damp localities, keep the entire length of the tape well oiled to prevent rusting.
I. CONSTRUCTION.
7. The instrument consists of three prisms securely fixed in metal frames. Each prism reflects at a different angle. These angles are 90% 88° 61' 15", and 74° 53' 15".^ 8. For convenience... of reference, the three prisms are called, re- spectively, 'first, second, and third.
The first is 90° ; .
The second is 88° 51' 16"; The third is 74^ 63' 15"; and this is the order in which they will most frequently be used.
The angles of -the prisms are so calculated that when the first and second prisms are used together in the manner explained below the range is equal to 50 times the base; that when the second and third prisms are used together the range is equal to 4 times the base ; and that when the second and third prisms and then the first and second prisms are used together (see Problem 2) the range is equal to 200 times the base; that when the second prism is used alone the range is 25 times the base.
What to read after Description And Instructions for Use of Weldon Range Finder, Revised March 1, 1906, Revised February 1, 1909?
You can find similar books in the "Read Also" column, or choose other free books by United States Army Ordnance Dept to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It is an accurate and sensitive instrument, and must be handled with skill and care. Avoid jerking, bending, or twisting it. If sand, grit, or dirt gets on it, clean it before winding. Also in wet weather, or in damp localities, keep the entire length of the tape well oiled to prevent rusting.
I. CONSTRUCTION.
7. The instrument consists of three prisms securely fixed in metal frames. Each prism reflects at a different angle. These angles are 90% 88° 61' 15", and 74° 53' 15".^ 8. For convenience... of reference, the three prisms are called, re- spectively, 'first, second, and third.
The first is 90° ; .
The second is 88° 51' 16"; The third is 74^ 63' 15"; and this is the order in which they will most frequently be used.
The angles of -the prisms are so calculated that when the first and second prisms are used together in the manner explained below the range is equal to 50 times the base; that when the second and third prisms are used together the range is equal to 4 times the base ; and that when the second and third prisms and then the first and second prisms are used together (see Problem 2) the range is equal to 200 times the base; that when the second prism is used alone the range is 25 times the base.
What to read after Description And Instructions for Use of Weldon Range Finder, Revised March 1, 1906, Revised February 1, 1909?
You can find similar books in the "Read Also" column, or choose other free books by United States Army Ordnance Dept to read onlineMoreLess
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