![]() ![]() ![]() Michael Hancock has produced an interesting history of the Burroughs Adding Machine Company and its calculators at. Add-listers were developed and manufactured in large numbers into the early 1970s where they were displaced in companies as much by computers as by electronic calculators. These machines were not intended toīe personal calculators and were large and expensive. Originally invented by William Seward Burroughs in the 1880s the Burroughs add-listers proved very successful and sold widely to companies, especially for use in accounting departments. The add-lister type of machine, as shown here, is much slower in use than the "Comptometer" type of machine since the handle has to be pulled forward to add (or subtract) each number entered in order to print it - though it does have the advantage of producing a printed record of all calculations which is useful for producing a permanent record. Note the nine "1" keys in the 10's of shillings column - 19 is the maximum number of shillings - and the extra "10" and "11" pence keys.Ģ90 mm wide, 340 mm long, 225 mm high (11.5" x 13.5" x 9"), 9 Kg (20 lbs.). It was made in Strathleven, Scotland (with "parts made in U.S. ![]() This is in contrast to the '10-key add-listers' where the digits of a number are entered in sequence. This allows faster operation since all of the digits of a number can be entered and latched in simultaneously using multiple fingers, before pulling the lever to perform the addition or subtraction. It has a 'full-keyboard' with numbers 0 to 9 in each decade. That is primarily an adding machine, though it can be used for subtraction and multiplication, which prints each number entered, and sub-totals and totals on the listing paper for a permanent record. Burroughs specialised in 'add-lister' mechanical calculators. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |