I found this calculator yesterday. I haven’t a clue what it might be for. The inner and outer wheels spin independently of each other. Any ideas?
ETA: There is no writing on the reverse side.
.
Gestation calculator- weeks since conception, weeks until due date.
Or some other use of “number of weeks from now”.
I don’t know what the *purpose *of it is, but it allows you to figure what date is X weeks in the future.
From the alignment in the picture, I can tell that 16 weeks from May 5 is Aug 26.
I think it’s just for translating between a number of weeks and a date. You line up the arrow with the current date (in the pic it’s May 5) and then you know that 18 weeks hence it will be Sept. 9.
Since it appears to be a promotional item from a company working on nuclear industry safety I’d guess it’s to quickly get from information about how many weeks it takes for a substance to be safe to what date that is.
I’d guess that in the nuclear industry, supplies (radiation badges, etc.) commonly expire after some number of weeks, or have to be reinspected every N weeks, etc…
Or perhaps some certifications are good for a given number of weeks, and it lets you know on which date you need to recertify equipment.
Or what he said.
Given that it was produced by Nuclear Logistics, I ruled out gestation periods. I guess I was wondering what the weeks calculator is needed for WRT the nuclear industry.
ETA: the last three posts came in while I was typing.
.
Plus if you line up the current date and day (i.e. put a ‘1’ on the inner wheel next to July 21), you’ll know the all other dates that have numbers are the same day, i.e. Sunday.
This wheel does not take Feb. 29 into account, though.
From the finer marks on the inside wheel, it looks as if you can also calculate the number of days between two dates. For example, the arrow is on May 5 in the illustration. To calculate the number of days to February 11 for example, is 40 weeks and 2 days. 40 * 7 = 280 plus 2 days equals 282 days. For leap years of course, you would add a day if you pass February 28.
Edit: Also, “Rio” by Duran Duran. 
FWIW: I suspect this is just a piece of branded swag rather than something specific to NLI, as in: I suspect NLI ordered a set of these with their logo printed on it to give out at conferences, to clients, etc. You find this sort of thing all the time, where cheap but useful items with a somewhat company-relevant purpose are branded and given out. Think: rulers, tape measures, digital timers, sterile wipes… stuff that’s a little more specific than the usual notepads and pens.
Just like it says. Number of weeks between two dates, or what date is x weeks from today. Had one back in the eighties for project management purposes. Ballpark estimates, handy in a conference room before laptops. Today, I use this or the actual project management software.
Vendors used to hand out stuff like that along with paper dodecahedron calendars and other crap. Today it’s blue LED flashlights and thumb drives.
Could it be used as a perpetual calendar?
Not without a Feb 29.
Where can I get one? I think I’d find it handy from time to time.
It is one essentially—sans days of the week—but only roughly. You’re on the Internet, you have better tools at you fingertips.
PM me your address and I’ll send you this one.
That’s the beauty of it–it doesn’t do anything!
<DnR>
Here’s one for days. Minimum order 10. More expensive in small quantities than I would have thought.
Here’s a template to make your own
They apparently called “Lead Time Calculators” to “calculate future delivery or project completion dates.” Seems to be a bunch of companies that will put your logo on them and they all look exactly like the OPs. See this Google image search.