Improvement to Palmer's endless self-computing scale and key : adapting it to the different professions, with examples and illustrations for each profession, and also to colleges, academies and schools : with a time telegraph making, by uniting the two, a computing telegraph / by John E. Fuller.

  • Fuller, John E. (John Emery), 1799-1878.
Date:
1851
Catalogue details

Licence: Public Domain Mark

Credit: Improvement to Palmer's endless self-computing scale and key : adapting it to the different professions, with examples and illustrations for each profession, and also to colleges, academies and schools : with a time telegraph making, by uniting the two, a computing telegraph / by John E. Fuller. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    .a Place 5 opposite 1 answer. io\v 1 is opposite 2 = 4, the To MULTIPLE ONE FRACTION BY ANOTHER. Rule.—Reduce one to decimals: then place the numerator of the other opposite the denominator: then opposite the decimal is the answer in decimals, which, if desired, can be reduced to a vulgar fraction by the preceding rules. to reduce the different currencies to federal Money. Rule.—Place the 1 on the circular, opposite the number of shillings and parts of a shilling composing a dollar of the currency to be reduced: then, opposite the given number of shillings is the answer. Example.—Reduce 5 shillings, New York cur- rency, to Federal money. Place 1 (on the circular) opposite 8: then opposite 5 shillings, is -625, the answer. In 15 shillings, how much ? Opposite 15 is 1-875, the answer. In 32 shillings, English currency, how much? Place 1 (on the circular) opposite 4-5: then oppo- site 32, is $7-11, the answer. In 9 shillings, how much ? Opposite 9 is $2, the answer. 21 Place 60 opposite -2, (the gauge point for months at 6 per cent.,) then opposite 8 months is $2-40, the answer. To compute Interest for Days. Rule.—Place the principal, (found on the circular,) opposite the gauge point for days at the given per cent.: then opposite the number of days is the answer. Example.—What is the interest on $55 for 15 days at 6 per cent ? Place 55 opposite -600, (the gauge point for days at 6 per cent.,) then opposite 15 days is -13 3-4. The Principal and Interest being given, to find the rate per cent. Rule for one Year.—Place the interest opposite the principal: then opposite 1 is the rate per cent. Example.—Received $7-00 for the use of $50-00 for one year; what was the rate per cent. ? Place 7 opposite 50 : then opposite 1 is 14, the an- swer, 14 per cent. Gave $4-00 for the use of $80-00 one year: what was the rate per cent. ? Place 4 opposite 80: then opposite 1 is 5, the an- swer, 5 per cent. 23 Place 23 opposite 21: now opposite 365 is 4 ace 4 opposite 50: then opposite 1 is S per cent. The Rate per cent, and the Interest beisc given, to find the Principal. Rule for one Year.—Place the per cent, oppo site 1: then opposite the interest is the principal. Example.—At 7 per cent. I paid $3-50 for the us of money 1 year : what was the principal ? Place 7 opposite 1: then opposite 3-50 is $50-0( the answer. Rule for Months.—Place the interest opposit the given number of months : then opposite the poit of the given per cent., for months, is the answer. Example.—Gave $2-00 at 7 per cent, for thre months : what was the principal? Place 2 opposite 3: then opposite 1*714 is $114*31 the answer. Rule for Days.—Place the given interest oppi site the given number of days: then opposite tl gauge point for days stands the principal. Example.—At 7 per cent., gave 15 cents for £ days : what was the principal ? Place 15 opposite 20: then opposite 521 (tl gauge point for days at 7 per cent.) is $39-00. tl answer. SO INTEREST. To compute Interest for Years. Rule.—Place the rate per cent, found on the err cular, opposite 1: then opposite the principal is the interest. Example.—What is the interest of $50 at 7 per cent. ? Place 7 opposite 1: then opposite 50 is $3-50, the answer. What is the interest on $40 at 6£ per cent. ? Place 6-5 opposite 1: then opposite 40 is $2-60, the answer. To compute Interest for Months. Rule.—Place the principal, (found on the circular,) opposite the gauge point for months at the given per cent. : then opposite the given number of months is the answer. Example.—What is the interest on $50 for three months at 7 per cent. ? Place50, (found on the circular,) opposite 1714, (the gauge point for months at 7 per cent.,) then opposite 3 months is -875, the answer. What is the interest on 6 per cent ' $60. for eight months at 22 Rule for Months.—Place the given interest op- posite the given number of months: then observe the number opposite 12. Now place this number oppo- site the principal: then opposite 1 is the rate per cent. Example.—Paid 25 cents for the use of $5-00 for 4 months : what was the rate per cent. ? Place 25 opposite 4: then opposite 12 is 75. Now place 75 opposite $5-00: then opposite 1 is 15, (15 per cent.,) the answer. Gave 14 cents for the use of $60-00 one month : what was the per cent. ? Place 14 opposite 1: then opposite 12 is 1-68- Now place 1-68 opposite 60: then opposite 1 is 2*8, (2j% per cent.,) the answer. Rule for Days.—Place the given interest oppo- site the given number of days: then observe the in- terest opposite 365 (the number of days in a year). Place this opposite the principal: then opposite 1 is the rate per cent. Example.—Paid 14 cents for the use of $64-00 29 days: what was the rate per cent. ? Place 14 opposite 29 : now opposite 365 is $1-76. Now place 1-76 opposite 64: then opposite 1 is 2-75 (2J per cent.,) the answer. Paid 23 cents for the use of $50-00,21 days: what was the rate per cent. ? 24 The Rate per cent., Interest, and Princtal beij given, to find the Time. Rule.—Place the interest of the given princip for one year opposite 12 : then opposite the given i terest will be the answer in months and decimals < a month. Or, place the interest of the given print pal for one year opposite 365: then opposite tl given interest will be the time in days. Example.—Gave 87,5 cents at 7 per cent, f $50-00 : how long did I have it ? The interest of $50-00 for one year, is $3-5 Place 3-50 opposite 12: then opposite -875 is tl answer, 3 months. Gave 24 cents at 7 per cent, for the use of $5< how long did I have it ? Place $3-50 opposite 365 : then opposite 24 is tl answer, 25 days. Compound Interest. Rule.—Place the principal opposite fig. 1 : th opposite the rate per cent, added to 100, on the fix part, is the amount for one year. Place thisamoti opposite fig. 1 : then opposite the same point is t amount for two years. Place this last amount opj site 1: then opposite the same point is the amou for 3 years, &c.