I wondered why Tom's proof was less than 2 x ABV as it would be now in US and Canada. I'd expect 54.6% ABV  to be 109 Proof.

I found this historical mess to explain:

https://www.foodnetwork.com/fn-dish/news/2017/07/why-alcohol-content-is-measured-in-proof


On Thu, Jul 30, 2020, 11:44 Thomas RUX, <xxxxxx@comcast.net> wrote:
Hello Phil,

On 07/30/2020 2:04 AM Phil Pugliese - philpugliese at yahoo.com (via tml list) <xxxxxx@simplelists.com> wrote:


Anyone have any idea what the recipe for mixing 'grog' was?
How about the 'proof' rating?


The rum ration or "tot", consisted of one-eighth of an imperial pint (70ml) of rum at 95.5 proof (54.6% ABV). Senior ratings (petty officers and above) received their rum neat, whilst for junior ratings it was diluted with two parts of water to make three-eighths of an imperial pint (213 ml) of grog.

Tom Rux

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