Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 26
In laying out the larger cyhnder, indicating the center ofthe opening, at 1 ^^, erect a perpendicular to the straight hne rsrepresenting the circumference of the cylinder. From l^^ set 25 … off on each side along the distance 1ii-2ii equal to the arc1/-2^ the distance 2ii-dii equal to the arc 2^-d^ continuingthus set off the remaining distances equal to the correspondingarcs, being sure that the whole distance from r is equal toone-half the figured circumference of the cylinder. From…
Projection
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