COMPTOMETER NEWS
Instruction Service Department
C. Vebeck
THERE certainly has been considerable interest shown in the "Instruction Service" Department. So many have requested instructions to cover their particular needs and sent samples of their figure problems so we could assist them on their daily work. There have also been many requests for the regular decimal cards and for special tables.
We were very glad to give the information and instructions requested. Among these requests were included:
A short method for figuring the contents of a partially filled horizontal tank.
How to prorate a bonus on a merit system.
How to use the least strokes and the least number of dividend and divisor figures when dividing, where, besides the whole part of the answer, a certain number of decimal places are required.
How to point off percentages.
Find average discount; and average date, etc., etc.
Don't forget that we invite your inquiries on how to do examples the easiest and best way on the Comptometer, and that we are glad to assist you no matter how large or trivial the question on Comptometer operation.
Now here are some more operations on the Comptometer to figure out.
Write us how you would handle them. Perhaps your way is better than ours.
"PROBLEMS"
Find the sum of the following divisions, getting only the one final total. No mental work and no figures to be written:
| 456 | ÷ | 184 |
| 2468 | ÷ | 1364 |
| 48 | ÷ | 1632.5 |
| 9775 | ÷ | 50 |
| 48630 | ÷ | 88889 |
Multiply the first example below on an 8-column Comptometer or the second on a 10-column Comptometer and get all and every figure of both whole and decimal parts of each answer, without writing anything except the answer:
| 5862.931 | × | 68132.91 |
| 58629.3142 | × | 6813291.83 |
Take a discount off of an amount that is in the left hand side of the register, i.e., take 45% off of $9.75 when the register reads from left to right 0975.
Multiply 14-7/39×2.14-1/2, over the permanent decimal point, without using decimals for 7/39.
Find elapsed time for the following by writing down only five figures and no mental work.
| A.M. | P.M. | ||
| In | Out | In | Out |
| 7:36 | 12:14 | 12:45 | 3:45 |
| 8:07 | 12:22 | 1:35 | 2:36 |
| 8:13 | 1:10 | 2:15 | 5:46 |
| 9:42 | 11:32 | 2:30 | 4:25 |
