Day 25Happy Friday the 13th Looks like the LM's med flat works well on the catch for paper towel dispenser at work. It's really just an arrowhead catch with a simple single warded keyway. If you have the right size flat head you can open it without the key. Too big you hit the ward, too small it wont catch.Much easier than raking a padlock with SAK tweezers
Day 28Range finding with a LeathermanEver hear the phrase "rule of thumb"? It is an old range finding technique. The basic idea is to know the size of a known object at a known distance compaired to the heignt of your thumb with your arm fully outstreached. A common example is a 6ft man at 50 or 100yards.Later in the 1800s a sliding gauge with a cut length cord or chain would be used. You bit down the end of the cord and pulled it tight while looking through the appature. Then adjust the size of the opening to fit the target and take your reading.These work on the principal that an object will appear half the size as distance doubles. For rough example a 6ft man may measure 1in tall 100 yards; 1/2in tall at 200; and 1/4in at 400.This of course is a rough example and not accurate. Many of you will see this principal optical rangefinders for golf, archery, artillery, and rangefindering reticle scopes.These methods can also be used with a simple ruler if you know how and have already paced off a known distance as a standard.The old ST is nice for this because where the ruler is positioned makes it easier to sight. If you have a a ruler on a boat or near a water horizon you can also measure the height of the sun from the horizon while holding it as straight. This combined with the length your arm will give you 2 legs of a 90deg triangle necessary to math out its angle. Knowing the angle of the sun on the horizon can give you a basic latitude if you have knowledge of such things. I dont, but I have several books and am learning very slowly."Practical military surveying and sketching" by Captian Drayson, R.A- 1861Avalable free on Google play books under the name Alfred Wilks Drayson Covers land based surverying, tools(construction description included), techniques and aplications"Latitude Hooks and azimuth rings: how to build and use 18 traditional navigational tools" bl Dennis Fisher 1995Is still in print and readily avalable. More sea based includes details of the ruler/sun technique Todays pics Me sighting along LM in grocery parking lot at nothing in particular, well mabey the donation bin, and a closeup of ruleReproduction 1800s rangefinder by ted cash, pic from ebay, see watermark for seller.
Thanks Now I need to decide what to do next, there are so many to pick from. Surge, Offbrand, Traditional, sak-minimal How to choose???