Page:Miscellaneous Papers on Mechanical Subjects.djvu/76

MR WHITWORTH'S PROPOSED DECIMAL SCALE.

STANDARDS OF SIZE.				WIRE-GAUGE.
Proposed Standards of Size for Taps and Dies.				Standard Wire-Gauge.			Old Birmingham Wire-Gauge.	Old Lancashire Wire-Gauge.	Old Metal of Plate-Gauge.	Old Needle Wire-Gauge.	Old Music Wire-Gauge.
No. of Screw Threads per Inch.	Old Sizes.	New Standard of Size. Decimals of an Inch.		Value of each No. in Decimals of and Inch.	New Nos. of Gauge. Thousandths of and Inch.		Old Nos. of Gauge corresponding to New Nos.	Old Nos. of Gauge corresponding to New Nos.	Old Nos. of Gauge corresponding to New Nos.	Old Nos. of Gauge corresponding to New Nos.	Old Nos. of Gauge corresponding to New Nos.
48		·100		·001	1
40	⅛	·125		·002	2
32		·150		·003	3
24		·175		·004	4		36		1	19
24		·200		·005	5		35		2	18
24		·225		·006	6		..		..	..
20	¼	·250		·007	7		34		..	17
20		·275		·008	8		33		3	16
18		·300		·009	9		32		..	15
18		·325		·010	10		31		4	14
18		·350		·011	11		..	..	..	..
16	⅜	·375		·012	12		30	..	5	13
16		·400		·013	13		29	80	6	12
14		·425		·014	14		28	79	..	11
14		·450		·015	15		..	78	7	..
14		·475		·016	16		27	77	8	10
12	½	·500		·017	17		..	..	..	..
12		·525		·018	18		26	76	..	9	6
12		·550		·019	19		..	75	9	..	7
12		·575		·020	20		25	..	..	8	8
12		·600		·022	22		24	74	..	7	10
11	⅝	·625		·024	24		23	72	10	6	12
11		·650		·026	26		..	71	..	..	13
11		·675		·028	28		22	70	11	5	14
11		·700		·030	30		..	68	..	..	15{[nopt}}