# Original Hubble diagram units incorrect?

Figure 1 from Hubble 1929 (original paper with open access pdf) has velocity with units of km. Is this just a typo or was there a reason the plot is printed this way?

• The paper indicates that it should be km/s. Maybe the creator of the graph was not awake when it was made.
– LDC3
Aug 17 '14 at 2:15

It is in fact supposed to be in $\mathrm{\frac{km}{s}}$ (KILOMETRES per second).

I think that whoever authored the paper, probably took it as a random shortcut and assumed anyone reading it would either have read the paper and understand it is supposed to be $\mathrm{\frac{km}{s}}$, or just assume it from the fact it says velocity.

• This can also be confirmed by the single cross mark in Figure 1 at the location described by the sentence "The result, 745 km./sec. for a distance of 1.4 x 10[6] parsecs..."
– uhoh
Dec 31 '17 at 8:45