The instructionsįor its use are given in my paper on Hudson’s computing scales. Of stroke at which steam is cut off, and back pressure & corners. The scales on the reverse are for correcting the Mean Pressure for percentage Woodworking Ruler Precision Pocket Rule - 12, 8, 6 Inch Metal Slide Stop Marking Ruler Metric Inch Measuring Wood Working Scribing Rulers Measure Tools - Engineers Woodwork Adjustable Sliding Ruler 4.7 (120) 1166 - 2866 FREE delivery Asphalt Sliderule Calculator Estimator 3. Is for Stroke, the next scale is for Mean Pressure and the bottom scale is for Cylinderĭiameter. Is for Revolutions and also Piston Speed, the adjacent scale on the second slide On theįront face the upper scale is for Indicated Horse Power. Hudson’s Horse Power Computing Scale for steam engines made by W F Stanley. The numbers 12 are marked with pins because they are also frequently used in timber calculations (there are 12 inches in a foot). The pins on the right relate to calculating the volume from diameter and length and those on the left from girth and length. For instance looking at the right hand 0 the value is 13.54, the ratio of the diameter for circular timber used to calculate the volume using the Girt line scale and the adjacent double radius log scale. In the mid- 1600s, the linear slide rule was invented. By sliding various components of the ruler to align with one another, a slide rule can compute products, roots, logarithms, and the result of trigonometric functions. Basically 0 indicates round, 8 is eight sided and 16 is 16 sided. A slide rule, also known as a slide ruler or a slipstick, is an extremely complex ruler that functions as an analog computer. These pins indicate gauge points associated with the rounding of timber and calculating its volume. Find high-quality stock photos that you wont find anywhere else. These two sets of three pins (one is missing on the left hand side) are labelled “Girt” and “Diameter” respectively and there are also numbers associated with these pins, namely 0, 16, 8 and 8, 16, 0 respectively from left to right. Search from 686 Slide Rule stock photos, pictures and royalty-free images from iStock. Returning to the first side and looking at the girt line scale there are two sets of brass pins, one either side of “12” (which also has a brass pin as does 12 on the top scale). Slide Rule - Etsy Slide Rule (1 - 40 of 903 results) Circular slide rule Pickett Hp calculator Price () Shipping All Sellers Vintage Slide Rule Cufflink & Tie Clip. On both edges are 0 - 24” x 1/4” linear scales (rulers). Afghanistan, Africa, Albania, American Samoa, Andorra, Anguilla, Asia, Austria, Bahamas, Barbados, Belarus, Bermuda, Bolivia, Bosnia and Herzegovina, Botswana, Cayman Islands, Central African Republic, Central America and Caribbean, Chad, Comoros, Cook Islands, Czech Republic, Côte d'Ivoire (Ivory Coast), Democratic People's Republic of Korea, Djibouti, Ecuador, El Salvador, Estonia, Falkland Islands (Islas Malvinas), Fiji, France, French Polynesia, Gambia, Germany, Gibraltar, Guam, Guernsey, Guinea-Bissau, Guyana, Honduras, Hungary, Iceland, Ireland, Jamaica, Jersey, Kiribati, Latvia, Libya, Liechtenstein, Luxembourg, Macedonia, Madagascar, Malawi, Maldives, Marshall Islands, Mayotte, Micronesia, Middle East, Moldova, Monaco, Mongolia, Montenegro, Morocco, Nauru, Nepal, Netherlands, New Caledonia, New Zealand, Nicaragua, Niue, North America, Norway, Palau, Papua New Guinea, Paraguay, Republic of Croatia, Republic of Cuba, Reunion, Romania, Russian Federation, Rwanda, Saint Pierre and Miquelon, San Marino, Senegal, Sierra Leone, Slovakia, Slovenia, Solomon Islands, Somalia, South America, Southeast Asia, Spain, Sudan, Suriname, Svalbard and Jan Mayen, Swaziland, Switzerland, Syria, Tonga, Trinidad and Tobago, Tunisia, Tuvalu, Ukraine, United Kingdom, Vanuatu, Vatican City State, Venezuela, Virgin Islands (U.S.Radius “inverted line” scale.
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