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Description: | Improved Perry calculating slide rule, 10 inch; in case, scale of inches and fiftieths on bevel edge, special cursor of aluminium and glass with pointer attached for rapidly calculating engine diagrams, etc., cursor has broken hair line for easy reading, double faced with celluloid log-log scales along the whole length and bottom edges; printed list of constants etc., pasted at back | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Subjects: | slide rules | Temporal: | 1910-1911 | Source: | Science Museum | Creator: | A G Thornton Limited | Identifier: | 1911-186 | Go to resource |
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