Felt & Tarrant printed many small tables to help the operator with common calculations. Such tables were usually printed on thick cardboard for durability. In the 1920 edition of "Easy Instructions for operating the Controlled-Key Comptometer" a list is given of various tables that were available at that time. I reproduce that list here. The ones on this list that I own are marked by an asterisk.
| Form Number | Title | Description |
|---|---|---|
| 1 | Tonnage Table | Gives the decimal part of a ton of any number of pounds. |
| 3 | Lumber Table | Gives result of dividing 12 into any dimension up to 11 7/8. |
| 4* | Discount Table | Gives the net of chain discounts. |
| 5 | Lumber Table | Gives number of board feet in pieces of various sizes. |
| 6 | Gross Table | Gives the decimal for each fractional part of a gross and for each unit. |
| 7* | Grain Table | Gives the decimal part of a bushel of any number of pounds of different grains. |
| 8 | Ten and 100 and 1000 X Inches and Fractions to Eighths Table | Used only in connection with the Engineering Model Comptometer for figuring beams, pipe, etc. |
| 9 | Reciprocal Table | Used for making division quickly and easily by multiplication. |
| 10 | British Currency Table | Gives the decimal part of a £ of any number of shillings and pence. |
| 12 | British Currency Table | Gives the decimal part of a £ for pence and 32nd fractions. |
| 21 | Quarters and Pounds of a Ton Table | Gives the decimal part of a ton of any number of Quarters and Pounds. |
| 22 | Quarters and Pounds of a Cwt. Table | Gives the decimal equivalents of a Cwt. from 1/2 lb. to 3 qrs. 27 lbs. |
| 24 | Interest Table | Gives the interest on $1.00 for different numbers of days at different rates. |
| 25 | Net Discount Table | Shows the net left from $1.00 after discounting for the required number of days. |
| 26 | Decimal Table | Used for figuring elapsed time. It gives the decimal part of a 360-day year up to any date. |
| 29* | Decimal Equivalents of Fractions Table | Gives decimal equivalents of fractions from 1/4 to 63/64. |
| 32 | Cooperage Table | Used to determine how many staves of one size are equivalent to another size. |
| 33* | Interest Table | Gives the interest on $1.00 for one day for rates from 1/8 % to 12 7/8 %. |
| 35* | Payroll Table | Gives the decimal part of a month for any number of days and eighths of days. |
| 36 | Insurance Cancellation Table | Shows decimal part of the year for months and days. |
| 37 | Figuring Elapsed Time Table | Shows decimal part of a year for each day. |
| 38 | Pounds, Ounces, and Drams Table | Gives the decimals of a 16-oz. pound for any number of drams and ounces. |
| 184 | Interest Table | Gives the interest on $100. at 7% for from 1 to 364 days. |
| 191 | Grain Table | Gives the Dockage and the net bushels per 1000 lbs. for different rates of dockage. |
| 205 | Weights per Foot and Inch for Rounds, Squares, etc. of Different Thicknesses Table | Enables one to get the weight of a piece. |
| 234 | Iron and Steel Table | Gives the price per 100 lbs. at .01 to $100. per gross ton. |
| 237 | Interest Table | Used for figuring interest on a 365-day basis, where interest rates run from 1 to 12%. |
Decimal Equivalents of Common Fractions To be used in Connection with the Comptometer.
Felt & Tarrant Mfg. Co., Chicago, U.S.A.
Series No. 2
108mm × 164mm
This card was included when I bought the 1911 edition of "Methods of Operating the Comptometer", so is likely from around that time, especially since the picture on it is of a model B or C Comptometer. The card is signed on the back by Adelina Artesani who according to the 1900 and 1910 census was born in 1894 and resident in Boston, MA.
Decimal Equivalents of Common Fractions To be used in Connection with the Comptometer.
Comptometer Division, Felt & Tarrant Mfg. Co., Chicago, Illinois
Form 29
102mm × 235mm
This card was included when I bought the "Table of Reciprocals" book, and it supplements that book by supplying some fractions that have numerators other than 1. Unlike most of the other cards, this one is printed partly in colour. It has no copyright year, but was probably printed in the 1940s as it has a picture of the model M.
Discount Table Showing net of $1.00 after discounts, shown at top and side, are taken off.
Comptometer Co., Chicago, U.S.A.
Form No. 4
165mm × 279mm
This card has no copyright year, but was probably printed in the 1940s as it has a picture of the model M. It is likely that earlier prints of this card exist.
Grain Table Pounds Expressed in Decimal Parts of a Bushel.
Felt & Tarrant Mfg. Co., Chicago, U.S.A.
Form 7
117mm × 267mm
This card has no copyright year, but was probably printed in the early 1920s as it has a picture of the model H.
Interest Table (360-day basis) To be used in Connection with the Comptometer
Felt & Tarrant Mfg. Co., Chicago, U.S.A.
Form No. 33
225mm × 159mm
This card has no copyright year, but was probably printed in the early 1920s as it has a picture of the model H.
Pay Roll Table Decimal Equivalents of Days and Eighth Fractions of Days, for 24-31 Day Months also Minutes expressed in Decimal Equivalents of an Hour.
Comptometer Co., Chicago, U.S.A.
Form No. 35
195mm × 322mm
This card carries a copyright year of 1925, but it must have been a reprint from the 1940s as it has a picture of the model M.
Decimal Equivalents of Fractions from 3rds to 26ths inclusive To be used in Connection with the Comptometer.
Comptometer Co., Chicago, U.S.A.
Form No. 368
185mm × 235mm
This card has no copyright year, but was probably printed in the 1940s as it has a picture of the model M.
Decimals of a Foot for each 1/8 of an Inch To be used in Connection with the Comptometer in Figuring Lumber, Steel Beams, Angles, Etc.
Comptometer Co., Chicago
Form No. 386
152mm × 253mm
This card carries a copyright year of 1925, but it must have been a reprint from the 1940s as it has a picture of the model M.
Ounces and Drams Reduced to Decimal of a Pound Table of Decimal Equivalents to be used in connection with the COMPTOMETER
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 3
253mm × 192mm
This piece of paper has no copyright year, but it has a picture of the Model H or J, and I suspect it is from about 1928. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
WAGES TABLE FOR 48-HOUR WEEK To be used in connection with the Comptometer
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 5
304mm × 178mm
This piece of paper has no copyright year, but it has a picture of the Model H or J, and I suspect it is from about 1928. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
For Calculating TIMBER SPECIFICATIONS Table to be used in connection with the COMPTOMETER
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 6
354mm × 240mm
This piece of paper has no copyright year, but it has a picture of the Model H or J, and I suspect it is from about 1928. It
is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
It is stamped with the name of the company that used it, W.H. Wheeler & Sons, Portsmouth.
For Calculating the Weight of Deals, Battens, and Boards at 66 cubic feet to the Ton Table of Decimal Equivalents to be used in connection with the COMPTOMETER
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 7
228mm × 240mm
This piece of paper has no copyright year, but it has a picture of the Model H or J, and I suspect it is from about 1928. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
GROSS, Each Fractional Part & each 144th To be used in connection with the COMPTOMETER. For Figuring Gross Invoices, Inventories, Plate Glass, etc.
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 8
209mm × 260mm (1925), 203mm × 256mm (1934)
This piece of paper has no copyright year, but it has a picture of the Model H or J, and I suspect it is from about 1928. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
This is a later print of the same table. It has a picture of the Model K so probably dates from about 1934.
Decimal Part of a Year for Each Day on a 365-Day Basis To be used in connection with the COMPTOMETER
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 9
184mm × 360mm
This piece of paper has a copyright year of 1914, though it was printed at a later date. From the dates used in the examples printed on the back I suspect it is from 1928. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
Annas & Pies as Decimal of One Rupee Table of Decimal Equivalents to be used in connection with the COMPTOMETER
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 10
328mm × 211mm
This piece of paper has no copyright year, but it has a picture of the Model H or J, and I suspect it is from about 1928. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
QRS. & LBS. into CWT. and QRS. & LBS. into TON To be used in connection with the COMPTOMETER
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 21, Dec. Card No. 22
151mm × 239mm (1925), 164mm × 264mm (1934)
This piece of paper has no copyright year, but it has a picture of the Model H or J, and I suspect it is from about 1928. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
This is a later print of the above tables. It has a picture of the Model K so it is probably from about 1934.
Decimal Equivalents of Common Fractions To be used in Connection with the Comptometer.
FELT & TARRANT LTD., Aldwych House, Aldwych, London, W.C. 2.
Dec. Card No. 29
127mm × 203mm
This card has no copyright year, but I suspect it is from about 1928. It is printed by the UK company. It has a list of useful conversion factors on the back.
Pence & Sixteenths of One Shilling and Pence & Thirty-Seconds of One Shilling To be used in connection with the COMPTOMETER
Felt & Tarrant, Ltd., London.
267mm × 209mm
This piece of paper has no copyright year but probably dates from 1934. It is printed by the UK company, and lists the various Felt & Tarrant branch offices around the country.
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