Nestler No 40

Click here to see a full length image of the front of the slide rule (222 kB).

This slide rule has the following scales on the front: C [D $mkg I] A. The $ m kg scale shows various conversion factors when read in conjunction with the D scale. For example:

1 m	=	1.094 yd
$1	=	£0.205
1 kg	=	2.205 lb

The I (interest) scale could also be labelled DIF since it is an inverted and folded D scale. It is folded so that 1% on the I scale is opposite 360 on the D scale.

The scales are 25 cm long. As well as the 25 cm ruler along the top edge there is a 10 inch ruler along the bottom edge that is not visible in the photograph.

nestler no 40 - back

The back of the slide (above and below) has three linear scales (L S d) to permit conversion between pounds (L), shillings (S) and pence (d). For example: 0.2 pounds = 4 shillings = 48 pence.

Click here to see the full length image of the back of the slide (60 kB).

back of slide - click to see full length

Also on the back of the slide rule are the tables of conversion factors listed below.

				Value in U.S. Gold
1 £	=	20 shillings	=	$4.8665
1 Mark	=	100 pfennigs	=	.238
1 Franc	=	100 centimes	=	.193
1 Lira	=	100 centesimi	=	.193
1 Peseta	=	100 centimos	=	.193
1 Kr. austr.	=	100 hellers	=	.203
1 Kr. swed.	=	100 öre	=	.268
1 Rouble	=	100 copeks	=	.515

26	inches	=	66	c'metres
82	feet	=	25	metres
82	yards	=	75	metres
87	miles	=	140	kilometres
31	sq. inches	=	200	sq. c'metres
140	sq. feet	=	13	sq. metres
61	sq. yards	=	51	sq. metres
5	cu. inches	=	82	cu. c'metres
600	cu. feet	=	17	cu. metres
85	cu. yards	=	65	cu. metres

1	U.S. Gallon	=	231	cu. inches
800	U.S. Gallons	=	107	cu. feet
1	Imperial Gallon	=	277	cu. inches
6	U.S. Gallons	=	5	Imperial Gallons
6	cu. feet	=	170	litres
14	U.S. Gallons	=	53	litres
46	Imperial Gallons	=	209	litres

108	grains	=	7	grammes
6	ounces	=	170	grammes
75	pounds	=	34	kilogrammes
63	h'dweights	=	3200	kilogrammes
63	engl. tons	=	64	metric tons