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The description and use of two arithmetick instruments together with a short treatise, explaining and demonstrating the ordinary operations of arithmetick, as likewise a perpetual almanack and several useful tables : presented to His most excellent Majesty Charles II ... / by S. Morland.
About this Item
- Title
- The description and use of two arithmetick instruments together with a short treatise, explaining and demonstrating the ordinary operations of arithmetick, as likewise a perpetual almanack and several useful tables : presented to His most excellent Majesty Charles II ... / by S. Morland.
- Author
- Morland, Samuel, Sir, 1625-1695.
- Publication
- London :: Printed and are to be sold by Moses Pitt ...,
- 1673.
- Rights/Permissions
-
To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.
- Subject terms
- Arithmetic -- Early works to 1800.
- Calculators.
- Almanacs, English.
- Cite this Item
-
"The description and use of two arithmetick instruments together with a short treatise, explaining and demonstrating the ordinary operations of arithmetick, as likewise a perpetual almanack and several useful tables : presented to His most excellent Majesty Charles II ... / by S. Morland." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A51382.0001.001. University of Michigan Library Digital Collections. Accessed May 8, 2024.
Pages
Page 4
The Operation of Substraction.
Having prepared the Instrument for Substraction as is before directed, suppose I would from 327 l. - 12 s. - 07 d. deduct 39 l. - 14 s. - 3 d.
First, I set on 327 l. - 12 s. 7 d. in their proper places. Then I begin with 3 d. of the Summe to be deducted, and set it backward, That is, I put the point of the Index into the hole under the Window of Pence, and turn it till it stand over against (3) in the Margent, which will leave (4) in that Window. Thus I set 14 s. back∣wards in the place of Shillings; And thus (39) in the Ʋnites and Tens of Pounds. And having so done, I ob∣serve if any (0) of the small Plates over head be remo∣ved from under its Line (as in Fig. D. in the place of Shillings, I find the small Plate over head moved) I put the point of the Index into that hole of the next place, that is under the Window, and turn it backwards under (1) in the Margent. After the same manner, because the small Plate over the place of Ʋnites of Pounds is re∣moved out of its place, I set back for it (1) in the place of Tens; And so likewise, because the small Plate over the place of Tens is removed, I set back (1) in the place of Hundreds. Which done, the remaining Summe, viz. 287 l. - 18 s. - 04 d. is found in the re∣spective Windows. As in Fig. E.