The first three columns are primarily in words and letters, and the final three are numbers.

1. Primary: the subject being referenced.

2. Secondary: additional information concerning the entry in the primary field.

3. Class: a one or two-letter code describing the primary entry as follows:

A - Author; C - Clockmaker; O - Other; P - Personality; S - Subject;

W - Watchmaker; R - Book Review; X - only slight mention is made.
(NB: The above letters may--and will--occur in many different combinations and orders.

4. Volume Number of the Bulletin--up to 2 numerals.

5. Whole Number, or issue number, of the Bulletin--up to 3 numerals.

6. Page Number--up to 4 numerals.

The final four columns (the locator data) appear as letters and (up to) 4 digit numbers. The letter column indicates the Class (as in 3. above) the next (1 or 2) digits indicate the Volume Number; the next (1 to 3) digits indicate the Whole or Issue Number; the final (1 to 4) digits indicate the Page Number.

Note that only the last two numbers are critical to locating a specific reference--Whole (Issue) No. and Page No. The last two numbers are the only important ones.

An example:

Primary	Secondary	Class	Vol. No.	Whole No.	Page No.
FRANKLIN CLOCK	ENGLISH EXAMPLE OF FRANKLIN CLOCK 'IL 3'	S	6	52	109

In the above example, 'IL 3' indicates that the article has 3 illustrations.

Should the Index entry look like this:

ACCOUNT BOOK, TERRY

E TERRY JR RECORD BOOKS NOTED

S

______

906

30

the lack of a Vol. No., and a 900 series number in the Whole No. column denote a Supplement[al publication] to the BULLETIN. Should you note a 900 series (not 999), in this column, refer to the Supplement Index.

The printed Master Index notes that in an entry such as

EQUATION CLOCK_____

BY BERTHOUD 'IL 1'_____

SX

R1

T3

34

that the entry refers to Reprint #1, in Issue 3 of the Timekeeper (the six issue predecessor of the BULLETIN). In practice, the 'R' and the 'T' designators rarely occur.

Equally, an entry of '999' in the Whole No. column denotes an advisory to check a specific entry in the Primary column.

Questions? Comments? Write to me at: DonnL@aol.com