how long is

[EDDE]

40 chains to inch
lookin at some oooold maps and it states 40 chains to an inch
1 chain =66 feet thankx kids

 

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[Gypsy Heart]

Does this help?

Maps from some countries may use imperial units, especially older maps. These maps displayed scale ratios but often they were of the form 60 chains to 1 inch or 2 miles to 1 inch, etc.

In this case measure mm on the map and multiply by the scale factor below (where 1 yard = 36 inches, 1 chain = 22 yards) ...

40 chains = 1 inch >> 40 x 22 x 36 >> 1 : 31,680 (scale factor)
60 chains = 1 inch >> 60 x 22 x 36 >> 1 : 47,520 (scale factor)
1 mile = 1 inch >> 63,360 x 1 >> 1 : 63,360 (scale factor)
2 miles = 1 inch >> 63,360 x 2 >> 1 : 126,720 (scale factor)
4 miles = 1 inch >> 63,360 x 4 >> 1 : 253,440 (scale factor)
Calculation: Measure 132 mm on a map which is scale 60 chains to 1 inch
132 x 47,520 = 6272,640 milimetres
ie 6,272.6 metres
ie 6.27 kilometres

 

[EDDE]

Does this help?

Maps from some countries may use imperial units, especially older maps. These maps displayed scale ratios but often they were of the form 60 chains to 1 inch or 2 miles to 1 inch, etc.

In this case measure mm on the map and multiply by the scale factor below (where 1 yard = 36 inches, 1 chain = 22 yards) ...

40 chains = 1 inch >> 40 x 22 x 36 >> 1 : 31,680 (scale factor)
60 chains = 1 inch >> 60 x 22 x 36 >> 1 : 47,520 (scale factor)
1 mile = 1 inch >> 63,360 x 1 >> 1 : 63,360 (scale factor)
2 miles = 1 inch >> 63,360 x 2 >> 1 : 126,720 (scale factor)
4 miles = 1 inch >> 63,360 x 4 >> 1 : 253,440 (scale factor)
Calculation: Measure 132 mm on a map which is scale 60 chains to 1 inch
132 x 47,520 = 6272,640 milimetres
ie 6,272.6 metres
ie 6.27 kilometres

nope terrible at math just want to know how long a chain was should have been more specific
actually mayb it does help this explains the sclae for the 1840 survey

 

[Night Stalker]

This posts reminds me why I despised math class

 

[Gypsy Heart]

ok....so if 1 chain equals 792 inches....then it would equal 1/80th of a mile......so 1 mile equals 80 chains

 

[kenb]

1 surveyors chain = 66 feet or 11 fathoms = 80 chains to the mile. Now I see gypsy has beaten me too it :P

kenb

 

[EDDE]

thankz for the input gang 8)