History of the city of Lawrence . h columnin the lower story of the Prescott. In the Pemberton Mill, 26 feet 10 inches, by 10 y^ 4,equals 1073 square feet which is supported by each column in the lower story; the roofbeing also supported in addition at the Pemberton. The roof when loaded with snowmight be equal to one-third or one-half another floor. When I have made an estimateof the strength of columns, it has been based on what weight they would have to sup-port. I always made an estimate, or have been furnished with one, for each particularcase, when called on to calculate the strength of
History of the city of Lawrence . h columnin the lower story of the Prescott. In the Pemberton Mill, 26 feet 10 inches, by 10 y^ 4,equals 1073 square feet which is supported by each column in the lower story; the roofbeing also supported in addition at the Pemberton. The roof when loaded with snowmight be equal to one-third or one-half another floor. When I have made an estimateof the strength of columns, it has been based on what weight they would have to sup-port. I always made an estimate, or have been furnished with one, for each particularcase, when called on to calculate the strength of columns. As I recollect now, it hasbeen my rule to make the columns of that size which would require a weight twelve orfifteen times greater than they will be required to support, to crush them. When Isay it would take twelve or fifteen times the weight to crush a column, I mean a columnmade and set as perfectly as the columns from which the rules are deduced. 15 114 ADVERTISEMENTS. ASAHEL DAVIS, MANUFACTURER OF A. DAVIS IMPROVED. Magneto-Electric Machine. WARRANTED TO GIVE BETTER SATISFACTION than any similar Machine in the market. BEPAIRING OF ALL KINDS AT SHORT NOTICE. With increased facilities for manufacturing, AND IMPOBTANT IMPROVEMENTS IN THE MACHINE, already well and favorably known, your orders are solicited. J8® Magneto-Electricity is now more in favor among intelligent Physicians than everbefore, and this machine is its own best testimonial of HISTORY OF LAWRENCE. 115 absurdity. But, for their imperfections, who was responsible?The founder was doubtless careful to forward no columns withimperfections which he had reason to believe would be mani-fest upon the outside. He may have known, and probablydid know, that they were not honestly cast; and it may betrue that Captain Bigelow should have critically examinedthem. But Mr. Putnam contracted for them, and he had evena deeper interest in them than Captain Bigelow. The fault,in our view, in this whole ma
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