I’m a land surveyor. My early mentors talked about calculating on a Monroe calculator but I’ve never seen one. We have files full of old Traverse Sheets which are a form they did coordinate geometry calculations on. I could see where you could key in the cosine or sine (looked up in a book) then crank up the distance to multiply (123.23 feet for example). Then write down the answer in the appropriate box on the form. I remember visiting my Dad in his office in the 1960s. He had a Marchant Figurematic. I remember him doing the click click click press the button then numbers appeared and I asked him “is that the answer?” No he said I have to look it up in the book, I was so disappointed. Every office had the hand crank adding machines, mimeographic machines and in the grocery store the big mechanical cash registers.
@someonespadre
Жыл бұрын
I learned something today. My Model K-160 carries to 10 places within the machine. The Model LA5-160 which I’m using manually (a lot easier to crank) only carries to 9 places within the machine. What this means is: putting 8 place sine or cosine close to 1 (0.99995678) on the keyboard works on the K but overflows on the LA5 at least given a distance over 1,000. This is when adding to a coordinate already in the lower dials, it may be okay just calculating the one side of a triangle. Monroe’s advice is distance on the keyboard and sine/cosine in the upper dials so I’m reversing that. It works either way in the Model K.
@pedronavarrete4369
5 жыл бұрын
Genial amigo Jaap, viendo tus videos he conocido mas de este marvilloso mundo de las sumadoras/calculadoras mecánicas y electromecánicas, tengo algunas sumadoras iguales a las de tu colección que las he conseguido en mi país Ecuador y otras en EEUU, Europa, etc.... claro que las mias no están en tan buen estado como las tuyas pero con ayuda de mi padre las estamos restaurando y dejándolas operativas, gracias por compartir tu colección y conocimientos, saludos desde Cuenca-Ecuador
@someonespadre
Жыл бұрын
My Monroe calculating machine looks like the model K in the video except the case is one piece, not four as the featured one. The only serial number I have found is R61294 on the left bottom edge of the carriage. That may not be the machine serial number, it could be a part number or maybe the carriage had its own serial number (it could possibly be replaced). No serial number is visible in the front. It may be inside. The keys are the older "mushroom" style, not the newer "cylinder" style that appeared in the roughly the 1940s. The paint is smooth. The upper register numbers are black on white, the lower register numbers are white on black which are harder to read, they are dirty. Everything works on mine if I'm careful. There is excessive resistence especially when there are carrying operations to the left side of the lower register. If I go too fast the inertia tends to make the carriage jump so the numbers don't advance properly. When I go slow and push through the resistence it works correctly. It isn't extremely dirty inside, just needs some clean-up and lube to hopefully help it work better. A friend recommended sewing machine oil, another on-line source is using clock oil and light grease (where it makes sense). I don't know which is best and how clean I have to get it. I don't want to disassemble the mechanicals inside. The keyboard works the best. I think the main issue is gumminess in the carriage, especially on the left side. 8 year old Grandson fiddled with it for a few minutes, he said, "this is just like a video game!" I'm trying to resist temptation to use it too much until I free up the mechanism better, don't want to break anything.
@someonespadre
Жыл бұрын
I got an electric Model LA for $10 today. 8 columns on the keyboard, 16 on the lower register. Everything is free except some keys are stuck internally so when the knob is rotated it puts numbers into the lower register even though the keyboard is cleared.
@someonespadre
Жыл бұрын
I think I’ve fixed the keyboard issue, the sliding stepped gears were stuck, I managed to get them freed up and working which was causing the stuck key problem.
@someonespadre
Жыл бұрын
I’m chasing down the automatic issues. The LA5 calculator mechanism is working. It matches my calculator and the Model K. I plug it in then push plus but it runs continuously until I manually disengage the switch or unplug it. The internal switch moves, not sure if it’s too sticky or a spring could be missing. Unplugged I push the plus then rotate it, a tooth hits it and it returns to off but plugged in it doesn’t. At least I figured out the switch part.
@douro20
4 жыл бұрын
I have a Model K. It is the K-20 version which adds a few extra digits to the keyboard and has a twenty-digit accumulator. Mine is missing one key and many of the keys have been replaced. I have cleaned and lubricated mine, and in the process found that one of the rollers holding up the carriage was broken off but it doesn't seem to affects its operation. The stepped drums, intermediate whees and carry wheel segments were lubricated with dry spray lubricant. I also once had an LA which is an L with an electric motor and semi-automatic division. I actually broke mine when I stupidly tried to remove the cover over the keyboard.
@someonespadre
Жыл бұрын
My Model K has 61294 stamped on a piece on the right and 61294 stamped on the bottom of the cast frame, I had to remove the base to find that one, it’s where the foot screws in. It has R61294 stamped on the bottom edge of the carriage casting. The striker hits the bell on underflow but no ring, that’s the only thing wrong with it. And it needs oil. I’m guessing it was made as early as 1921. The front of the casting has K-175 cast in raised characters (not stamped). It weighs 28 lb.s (12.7kg)
@someonespadre
Жыл бұрын
Went into a thrift store today for something else. Come around a corner and on a bottom shelf is a Monroe Calculator which looks pretty close to exactly like your bottom left machine. $16 except I got it for $8 if you can believe that (everything 50% off). Everything appears to be working. The item counter only works if I press 1 then turn it then it works. I’m still baffled by division. I’ve done one successfully but not a 2nd one. Haven’t heard a bell. Serial number (on the bottom edge of the carriage left side) is R61294. Also scored a 1930s (probably) K+E Favorite Slide Rule (4055) in an antique shop-$40. A beginners slide rule, A, B, C & D with Sine, Log, Tan and conversion tables on the back. Looks like Mahogany. I’ve been learning my Dietzgen Decimal Trig Log Log Slide Rule which is much more advanced (inherited from my Dad).
@someonespadre
Жыл бұрын
Made progress on division. If it underflows it seems to get jammed, then fiddle with it until it turns again. As long as I don’t underflow it works.
@RatKindler
5 жыл бұрын
I've got a model LA7 that has an intermediate gear with a broken tooth. I don't know how I'd replace it but I've been toying with the idea or trying to make one from some thick sheet metal. Have you had to replace a broken gear? Are there any videos showing how to remove the intermediate gears? It looks pretty daunting to me.
@jaapsch2
5 жыл бұрын
That does look daunting, and fortunately for me I have not had to do that. There is a 25-part video series by Robert Baruch of disassembling a model K which might be somewhat useful: kzitem.info/door/PLEeZWGE3PwbazQmX9gRQm8_2hpCYuopTY
@doubledeuce5084
3 жыл бұрын
I just got a machine I bought with many unrelated items. It looks older, doesn't have a serial number where yours does and so far I haven't located one. The face of it is all black, and without some of the keys your model k has. Any idea what it is?
@jaapsch2
3 жыл бұрын
How does it compare to the Monroe model F? See my later video: kzitem.info/news/bejne/x6Gq1Xd9s6N9m34 It could also be a model G, which is very similar to the F. Both have the serial number on the back plate.
@doubledeuce5084
3 жыл бұрын
@@jaapsch2 Double Deuce 1 second ago I think it is a model F. On your site it says the model F has 20 digits, so at first I thought it must be a G because it has 16 like mine, but there are some small differences to the G and looking back at your F it has 16 digits too. Mine has a chrome strip attached to the carriage to the 4 holes shown in your video and no serial number on the back or anywhere else on the outside. I had another set of eyes look also. Mine is very dirty as it sat outside for a few weeks to months on a pallet, before I got it. Some rust but mostly dust. It has the same knobs as the F & G. If it had a serial # I would know for sure. Thanks PS Sorry I answered incorrectly on your F video.... the wrong video.
@jaapsch2
3 жыл бұрын
I'm fairly sure you have a model G then, as those have a rail instead of a row of holes in the carriage. They do normally have the serial number on the back, but maybe it had (part of) its case replaced, losing the number. I don't think the number can be found anywhere else unfortunately. Thanks for pointing out the mistake on my site. I fixed that.
@doubledeuce5084
3 жыл бұрын
@@jaapsch2 Yes, I see that rail difference. However the decals are the same as your F on the front and possibly on the back. Mine says Registered Trade Mark in the line under Monroe on the back. I couldn't tell if your F had that. The G are different. Maybe it is an early G since the red reset button is also like your F and not large like the G. Thanks for your help.
@doubledeuce5084
3 жыл бұрын
Just a thought, but maybe it wasn't given a serial number because it was the last F or the 1st G and weren't sure what to stamp it.
@ChrisStaecker
5 жыл бұрын
How'd you get them so clean?
@jaapsch2
5 жыл бұрын
The secret is to buy them in that condition from another collector :-) I bought the K and L recently from someone who has been selling off his whole collection. The KA was not from a collector, and is in rather poor condition. It was very cheap however, as I essentially got it for free bundled with two other machines I wanted to buy.
@DiegoPerez-wj1oq
Жыл бұрын
Tengo la monrro matic. Estoy tratando de restaurar
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