## The American House Carpenters' and Joiners' Assistant: Being a New and Easy System of Lines, Founded on Geometrical Principles, for Cutting Every Description of Joints, and for Framing the Most Difficult Roofs; to which is Added a Complete Treatise on Mathematical Instruments. Also, Mensuration, Tables of the Weights and Cohesive Strength of the Several Materials Used in the Construction of Buildings, &c |

### From inside the book

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Page 53

... scale con- tains a smaller or a greater number of parts in an inch . Scales of equal parts may be divided into three kinds ; simply divided scales , diagonal scales , and

... scale con- tains a smaller or a greater number of parts in an inch . Scales of equal parts may be divided into three kinds ; simply divided scales , diagonal scales , and

**vernier scales**. - Simply divided Scales . Simply divided scales ... Page 55

... scale . On the parallel indicated by the third figure , measure from the diagonal indicated by the second figure to the vertical indicated by the first .

... scale . On the parallel indicated by the third figure , measure from the diagonal indicated by the second figure to the vertical indicated by the first .

**Vernier Scales**. - The nature of these scales will be understood from their ... Page 56

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**vernier scale**. Increase the first figure by one ; subtract the third figure from the second , borrowing one from the first increased figure , if necessary , and extend the compasses from the division upon the**vernier scale**, indicated ... Page 57

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**vernier scale**may advantageously be laid down paper upon which the plot is to be made . A**vernier scale**is preferable to a diagonal scale , because in the latter it is extremely difficult to draw the diagonals with accuracy , and we ... Page 67

... scale , or the length corresponding to four or even five figures may be estimated upon a

... scale , or the length corresponding to four or even five figures may be estimated upon a

**vernier scale**, or upon the beam compasses , if the scale be not less than twenty inches in length . These lengths are to be set off from the 1 at ...### Other editions - View all

### Common terms and phrases

26 Spruce St angle rib beam beam compasses bevel breadth Cast Iron circle circumference colatitude constructed copy cube root cubic feet depth describe the arc diagonal diameter divided draw the lines edge Eighths elevation ellipsis extent will reach Figure floor frame girders given line given number gnomonic projection half hypothenuse inches instrument Invented and Drawn jack-rafters Join joists length in feet limb line of chords line of numbers line of sines Lith 26 Spruce meridian method of finding multiplied nail number of degrees number of equal pencil perpendicular plane Plate polygon primary divisions proportional purlin quadrant quarter girt quotient radius regular polygons represent right angles right line roof rule Rule.-Multiply screw secants sector Shows the method slider sliding soffit square root straight line stroke subdivision tangents thickness transverse distance triangle truss vernier scale weight