 | John Fry Heather - 1871 - 236 páginas
...second section * The accurate square is 2601, but the fourth figure cannot be estimated upon a foot rule. The solution, in fact, may be considered as obtained to within the 1000th part of the -whole ; but, if greater accuracy is required, arithmetical methods must be... | |
 | 1879 - 690 páginas
...robs the rule of many of its advantages. With the foot slide-rule, Mr. Heather says that the solution may be considered as obtained to within a two-hundredth part of the whole, but the liability to error is considerable, ami there is an undoubted strain on the eyesight. Mr. Fuller... | |
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Instruments, writes in relation to the foot slide rule : " The solution in fact may be considered as obtained to within a two-hundredth part of the whole. 