Note Spacing
Holes / Keys Per Inch
Exact Ratios
Conversion Chart
Other Information
Unknown Spacing

Note Spacing

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Holes / Keys Per Inch

less than 1 per inch

1 or more per inch

2 or more per inch

3 or more per inch

Roller Organ (Gem, Concert, Chautauqua, etc.)

4 or more per inch

5 or more per inch

6 or more per inch

7 or more per inch

8 or more per inch

Intona

9 or more per inch

Lucia

10 or more per inch

Aeolian (116-Note)

Exact Ratios

1.88
1.89
- E.P. Needham
2.00
- Melodette
2.50
- Roller Organ (Grand)
2.90
2.92
- Little Dot
3.33
- Roller Organ (Gem, Concert, Chautauqua, etc.)
4.00
4.18
- Organina Thibouville
5.00
6.00
6.50
- Ariston (24-Note)
- Herophon
8.35
- Intona
9.60
- Lucia
12.00
- Aeolian (116-Note)

Conversion Chart

per inch	in spacing	cm spacing
1.88	.532	1.35
1.89	.529	1.34
2.00	.500	1.27
2.04	.490	1.25
2.50	.400	1.02
2.90	.345	.876
3.33	.300	.763
4.00	.250	.635
4.18	.239	.608
5.00	.200	.508
6.00	.167	.423
6.50	.154	.391
8.35	.120	.304
9.60	.104	.265
12.0	.083	.212

Other Information

Additional identification data (especially for larger organs) may be found at:

Unknown Spacing