Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 15
. T-Square. The length of a T-square is alwaysmeasured by the length of the blade outside of thehead. The T-square should always be as long asthe drawing board, and if possible a little longer.For the general run of work the head of the T-square should be of a single and fixed piece, that 12… … Fig. 13—60 and 45 Degree Triangles. form of T-square is shown in Fig. 12, which has aslanting blade, the working edge of which is linedwith ebony.
Mechanical drawing · Machine design
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